ROSEBURG, OR –After two years of intensive scientific investigation, multi-agency cooperation, and extensive collaboration with the public, the Draft Environmental Impact Statement (DEIS) for the Diamond Lake Restoration project is complete. On March 22, 2004, the Umpqua National Forest began mailing copies of the (DEIS) to interested members of the public, and state and federal agencies. The 45-day public review and comment period for the project begins April 2 and ends May 17, 2004.

The Diamond Lake Working Group, representing multiple local, state, and federal agencies, began meeting in 2002 to develop solutions to address Diamond Lake's declining water quality and recreational fishery. Both declines are attributed to an overpopulation of the lake by tui chub. As lead agency, the Umpqua National Forest assembled an Interdisciplinary Team in April 2003 to research and write the DEIS. The Oregon Department of Fish and Wildlife and Oregon Department of Environmental Quality both served as cooperating agencies in the preparation of the document.

The DEIS examines a No Action alternative, as required under the National Environmental Policy Act, and three action alternatives for improving the water quality and recreational fishery at Diamond Lake. Actions include: canal reconstruction, lake draw down, mechanical fish removal and utilization, a rotenone treatment to eradicate tui chub, fish carcass removal/use, monitoring, education, and fish stocking.

Copies of the DEIS are available for review at the Diamond Lake Ranger District in Toketee, the North Umpqua Ranger District in Glide, or the Forest Supervisor's Office in Roseburg. Copies can also be obtained by calling Sherri Chambers at 541-496-3532 or visiting the website at www.fs.fed.us/r6/umpqua . Appendices are contained in the CD-ROM that accompanies the document, with paper copies available on request.

Umpqua National Forest Supervisor Jim Caplan identified Alternative 3 as the preferred alternative in the draft. Written comments should be addressed to: Diamond Lake Restoration Project Interdisciplinary Team, 18782 North Umpqua Highway, Glide OR 97443. Electronic comments may also be sent to comments-pacificnorthwest-umpqua-diamondlake@fs.fed.us . In order to be considered as a timely comment, the public must review and comment on the Draft EIS by May 17, 2004. Public meetings will be held in Roseburg, Medford, and Eugene in late April to exchange information about the project with interested members of the public.

ROSEBURG –The Umpqua National Forest is officially starting the Environmental Impact Statement (EIS) process for improving the water quality and recreational fishery at Diamond Lake by publishing its Notice of Intent in the Federal Register on Friday, April 25. The Notice of Intent, which describes the actions proposed at this time, gives interested and affected people the opportunity to participate in the environmental analysis and decision-making process.

Failure to address existing problems at Diamond Lake is expected to result in recurring summer algae blooms and lake closures, increased negative downstream water quality impacts, and continued declines in the lake’s ecological health and recreational fishery, and continued negative economic impacts.

Based on the work of a multi-agency Diamond Lake Project Working Group, the Forest Service is proposing to eradicate tui chub from Diamond Lake as an essential step in improving water quality and the recreational fishery. Changes in lake ecology associated with overpopulation of the lake by tui chub are believed to be major contributing factors influencing the development of toxic algae blooms and the declining recreational trout fishery. Actions at this time include drawing down the water level in the lake, using rotenone to kill tui chub, and using ecological indices to determine an appropriate strategy for restocking the lake with fish.

People should send their comments about the proposed action to Jim Caplan, Forest Supervisor, Umpqua National Forest, 2900 NW Stewart Parkway, Roseburg, OR  97470, by May 30, 2003. Public comments are appreciated throughout the analysis process.

The draft EIS is expected to be filed with the Environmental Protection Agency (EPA) and be available for public review by February 2004.  The comment period on the draft EIS will be 45 days from the date the EPA publishes the notice of availability in the Federal Register.  The final EIS is scheduled to be available in May 2004.

For more information about the proposed action or EIS, or to be added to the Diamond Lake mailing list, contact Sherri Chambers, (541) 496-3532 or schambers@fs.fed.us.

ROSEBURG – Diamond Lake, Douglas County's "Gem in the Cascades" is the topic of a public forum in Eugene Wednesday, Oct. 9. The forum is scheduled for 6:00 p.m. to 8:30 p.m. at Lane Community College, Building 17, Rooms 308/309.

"We really want to see Diamond Lake returned to a fishable, swimmable lake," said Oregon Representative Susan Morgan, who is leading the Project Working Group. "We're excited to get out and meet the public, fill them in on what we've learned so far and get their opinions and feedback."

The forum begins at 6:00 p.m. with presentations on water quality, fisheries, economics and recreation at Diamond Lake. Speakers will update the public on current information and discuss possible management options. Attendees then will have the opportunity to talk individually with the speakers and other representatives of the Project Working Group, ask questions and share concerns.

The Project Working Group includes Representative Morgan, the U.S. National Forest Service, U.S. Fish and Wildlife Service, Environmental Protection Agency, Oregon Department of Fish and Wildlife, Oregon Department of Environmental Quality, Oregon Water Resources Department, Oregon Economic and Community Development, and Douglas County. The Eugene meeting culminates a series of four public forums that have been held by the group in southern Oregon during September and October.

ROSEBURG – Diamond Lake, Douglas County's "Gem in the Cascades" is the topic of public forums in Medford and Klamath Falls next week.  The forums are 6:00 p.m. to 8:30 p.m. Oct. 2 at the Medford Red Lion Hotel, 200 N. Riverside Avenue, and Oct. 3 at the Klamath Falls Museum, 1451 Main Street.

"We really want to see Diamond Lake returned to a fishable, swimmable lake," said State Representative Susan Morgan who is leading the Diamond Lake Project Working Group.  "We're excited to get out and meet the public, fill them in on what we've learned so far, and get their opinions and feedback."

The forums begin at 6:00 p.m. with presentations on water quality, fisheries, economics, and recreation at Diamond Lake.  Speakers will update the public on current information and discuss possible management options.  Attendees can then talk individually with the speakers and other representatives of the Project Working Group, ask questions and share concerns.

The Project Working Group includes Representative Morgan, federal agencies of the Forest Service, Fish and Wildlife Service, and Environmental Protection Agency, and Oregon state departments of Fish and Wildlife, Environmental Quality, Water Resources, Economic and Community Development, and Douglas County.  The group is holding public meetings around southern Oregon in September and October.  The final meeting is scheduled for Eugene on Oct. 9.

ROSEBURG – Diamond Lake, Douglas County's "Gem in the Cascades" is the topic of a public forum on Sept. 25.  The forum is scheduled for 6:00 p.m. to 8:30 p.m. at the Douglas County Library.

The forum begins with a panel of speakers who will discuss issues surrounding Diamond Lake such as water quality, fisheries, economics, and recreation.  The panel will update the public on current information gathered and discuss possible management options.  Attendees can then talk individually with the speakers and other representatives of the Diamond Lake Project Working Group, ask questions and share concerns.

"We really want to see Diamond Lake returned to a fishable, swimmable lake," said State Representative Susan Morgan who is leading the Project Working Group.  "We're excited to get out and meet the public, fill them in on what we've learned so far and get their opinions and feedback."

The Project Working Group is holding a series of public meetings around southern Oregon in September and October.  The next meeting is scheduled for Medford on Oct. 2 followed by Klamath Falls Oct. 3 and finally Eugene on Oct. 9.  For more information, contact Sherri Chambers at 541/496-3532.

The Project Working Group includes representatives from the Umpqua National Forest, U.S. Fish and Wildlife Service, U.S. Environmental Protection Agency, Oregon Dept. of Fish and Wildlife, Oregon Dept. of Environmental Quality, Oregon Water Resources Dept, Oregon Economic and Community Development Dept., Douglas County, and Representative Morgan.

ROSEBURG – A new map of Diamond Lake is being created next week to better define the depth and volume of water in the lake. A fish assessment study will also provide Oregon Department of Fish and Wildlife biologists with more accurate information on fish distribution and total biomass in the lake. This information is important in ongoing discussions about returning Diamond Lake to a fishable, swimmable lake.

Mapping and fish netting in the lake are taking place next week. A media day is scheduled for Aug. 28.

The current map of Diamond Lake is based on a 1946 Oregon Fish Commission map created with outdated lead-line technology and inadequate measurements. Lead-line technology relies on the mapper's ability to feel when the lead weight hits the lake bottom. Because Diamond Lake has very soft sediment, it's likely the original map shows more water volume than is actually in the lake.

This mapping effort will result in a high-quality digital map that can be used to calculate

water depth and volume relationships, called hypsography. The new map will be based on more than 100,000 electronic soundings, which will precisely define depth and general sediment characteristics of Diamond Lake. The fisheries hydroacoustic work will provide estimates of fish biomass by size class. The map should be available to the public later this year.

Professional hydrologist Joseph Eilers and Dr. Chad Gubala are leading the mapping effort. The $30,000 project cost is funded by a grant from the Oregon Wildlife Heritage Foundation.

Collaborative discussions and data gathering research are ongoing activities for the Diamond Lake Project Working Group, a team of several state and federal agency representatives and Douglas County that is working with State Representative Susan Morgan to explore potential short-term and long-term solutions to Diamond Lake issues. The group identified updated mapping and a need to better estimate fish numbers and distribution as a data gap in their ongoing study of the lake.

The Diamond Lake Project Working Group includes representatives from ODFW, Umpqua National Forest, U.S. Fish and Wildlife Service, U.S. Environmental Protection Agency, the Oregon Department of Environmental Quality, Oregon Water Resources Department, Oregon Economic and Community Development Department, Douglas County, and State Representative Susan Morgan.

More information.

To be added to the Diamond Lake mailing list, contact Representative Susan Morgan at PO Box 2223, Myrtle Creek OR 97457 or email morgan.rep@state.or.us.

ATTENTION MEDIA: Dave Loomis (ODFW), John Ouimet (Umpqua National Forest), Chad Gubala and Joe Eilers will be available to the media from 10:00 a.m. to 12:00 p.m. at the boat docks, Diamond Lake Resort Marina, Aug. 28. Because the mapping effort is so intense and cannot be easily interrupted, this time has been set aside specifically to address questions from the media.

ROSEBURG – History will be in the making on May 17 when the Oregon Department of Fish and Wildlife stocks hatchery spring chinook in Diamond Lake. These 24,000 legal-sized fish are part of an experimental stocking program designed to provide a fishery for the lake that has been overrun with tui chub.

"In the ocean, spring chinook aggressively pursue small fish like herring and sardines, so we hope they will swim after tui chub in the same way," says ODFW district fish biologist Dave Loomis. "We chose to stock the springers for this predatory behavior and hope they think the lake is a small ocean with lots of small fish to eat."

According to Loomis, one of the goals of the experimental stocking program is to find a fish that will actively prey on chub so the return rate to the angler is higher than the past few years with rainbow trout stocking. "We know the lake has plenty of chub, and these salmon can't eat every last one to solve the problem long-term, but it's important to explore other opportunities for Diamond Lake anglers right now."

Diamond Lake has been a premier rainbow trout fishery since ODFW began stocking in 1910. No other trout species has been stocked in the lake's history. Tui chub were introduced in the early 1940s when anglers used them as live bait to catch large rainbow. The chub were eradicated by the fish toxicant rotenone in 1954 as the trout fishery collapsed from the impacts of these fish. As a result of the devastation at Diamond Lake, the former Oregon Game Commission made it illegal to use live fish for bait in the state of Oregon. However, chub were used illegally as live bait in the 1990s and have exploded to a population in the millions. The trout fishery has since declined, and along with it, the water quality of the lake.

Loomis and other biologists will be studying the spring chinook to determine how efficient they are at feeding on tui chub. "We really don't know how these landlocked chinook are going to fare in the lake, what their growth and overall survival rates will be," Loomis said, "and we need to know what we'll get in terms of a fishery. Diet studies will begin later this summer, continue into fall, then resume again the following two summers.

The spring chinook have been raised at Rock Creek Hatchery since October 2000 and will be released into Diamond Lake as 18-month-old smolts at a cost of $1.25 per fish. The salmon are eight to 10 inches and weigh about a pound each. Landlocked salmon are considered trout, so the bag limit is five fish per day, one of which can be over 20 inches.

Some of the fish will mature this fall and try to spawn in the lake, while most will mature the following two years. Ocean-going spring chinook average 15 to 20 pounds when they return to Oregon's rivers. Loomis predicts these landlocked salmon could grow to over 20 inches and weigh five to 10 pounds at maturity in a few years. The quality of the meat may also differ since the Diamond Lake chinook will have a much different diet than the ocean-going salmon.

Although ODFW biologists will intensively study the fishery, Loomis encourages anglers to catch and keep the spring chinook. "We're really interested to hear from the anglers what they think about catching and enjoying a feast on a lake-reared chinook," he said.

ODFW plans to stock Diamond Lake with 60,000 spring chinook next summer and will seek funding for another 60,000 in the summer Other stocking plans for this summer and fall include 20,000 trophy-sized rainbow trout, 26,000 legal-sized rainbows, and 50,000 fingerling rainbows.

Attention Media: If you would like to film the spring chinook being loaded at Rock Creek Hatchery or stocked in Diamond Lake, please contact Meghan Collins at 541/440- 3353 or cell 541/530-1877 or Rock Creek Hatchery at 541/496-3484.

Stocking is scheduled to take place mid-morning on May 17. More exact times should be known by May 16.

Diamond Lake has a special place in the hearts of all Oregonians. Many of us have great memories of this famous lake. The amazing thrill of landing your first fish; getting a hands-on biology lesson while cleaning your catch; taking a late afternoon swim to work up an appetite for that fish dinner; and watching the sun set while the frying pan is sizzling on the Coleman. Our histories are interwoven with stories of expeditions to Diamond Lake and all the wonderful experiences, learning, and enrichment that takes place when families share recreation together.

We cannot ignore the fact that Diamond Lake has undergone some changes in the past ten years. Tui chub have over-populated the lake. As a result, the rainbow trout are starving, and the algae balance in the lake has changed dramatically. The blue-green algae that bloomed last year and again this year is a health hazard to both people and animals.

To do nothing will keep the lake on a path where it will fill up with dead algae and become increasing hostile to fish as the blooming algae takes the available oxygen from the water.

To do nothing will take away forever one of the best opportunities we have for families to share and pass on the values of our Oregon life style. We will lose a piece of our heritage.

To me, doing nothing is clearly unacceptable. But, what to do is not so clear.

There are a great many government agencies that oversee a complex body of regulations that will govern any action taken on the lake. Our federal partners are the U.S. Forest Service, the U.S. Fish and Wildlife Service, and the Environmental Protection Agency. On the state level, the Oregon Department of Fish and Wildlife, the Department of Environmental Quality, the Economic and Community Development Department, and the Water Resources Department could all have a regulatory role in a solution to Diamond Lake. On the local level, Douglas County has an important role to play.

Several months ago, I asked these agencies to join together, in a work group, to seek a solution to the health and recreation problems at the lake. In the course of our discussions, we have found a great deal more common ground than differences. We have hosted a symposium of experts in water quality, fisheries issues, and economics; collected a detailed body of information; and got valuable science-based recommendations to return the lake to a swimmable, fishable condition. We are working our way through an assessment of permitting requirements and a thick tangle of regulations.

As a result of this process, we have recently identified a data gap. We hope to fill that gap with a study at the lake while the Anabaena is blooming. The study will allow us to explore the relationship between water temperature and the toxic algae bloom, and the feasibility of using an aeration treatment on a larger scale. The results of the experiment will be added to a body of reasonable, science-based information we are trying to build. This information will be used as a basis for a discussion on treatment options. We are hoping that each of you who care about Diamond Lake will be part of the discussion.

The Work Group is currently developing a public involvement process to pass this information on to you, so that we can work together to restore Diamond Lake to a swimmable, fishable lake. If this process seems painfully slow to you, please consider the complexities, both biological and regulatory, that we must work through. If you feel that we are moving too quickly and without due thought, please recognize that the lake’s, and our families’ clocks are ticking.

Please join us in finding a path through this.

More information

To be added to the Diamond Lake mailing list, drop a card to Susan Morgan at P.O. Box 2223, Myrtle Creek, 97457, or email morgan.rep@state.or.us

A new step in restoring Diamond Lake is underway with an experimental study being conducted next week. The study deals specifically with a species of blue-green algae (Anabaena flos-aquae), public health issues, and lake closures.

This species of blue-green algae causes toxic blooms that degrade water quality and can affect public health. Last summer, Diamond Lake was closed for three weeks because of a toxic bloom, and it is currently closed to swimming and water skiing.

The lake isn't meeting state water quality standards. It isn't meeting the recreational and economic expectations of Oregonians. We are concerned that the lake might someday become choked with algae in the summer months and no longer support fish or quality recreation uses. We know the public cares about these problems, and we do, too.

Lake conditions are created by many factors, including temperature, wind, available nutrients, and the presence of fish. Before we propose any corrective actions, we want to know more about how the lake and the species that live in it function. This fall and winter, we plan to present the information we have to Oregonians and seek their ideas about how to deal with Diamond Lake's condition. We want to be responsive to the ideas, interests, and concerns of everyone who cares about Diamond Lake.

State Representative Susan Morgan, U.S. Forest Service, U.S. Fish and Wildlife Service, U.S. Environmental Protection Agency, Oregon Department of Fish and Wildlife, Oregon Department of Environmental Quality, Oregon Water Resources Department, Oregon Economic and Community Development Department, and Douglas County are all cooperating on this experimental study. These agencies have the authority and responsibility to protect public health, improve water quality, and provide for recreational uses at Diamond Lake.

The planned experiment will take place inside a temporary structure, called a limnocorral, in an area of Diamond Lake. The limnocorral is a circular tube of clear plastic sheeting that looks like a Slinky toy with floats on the surface and weights anchoring the bottom. It will create a circular column of water ten feet in diameter to study. A compressor drives air to the bottom of the limnocorral to keep the water column moving. A boat will be anchored next to the column to house the generator and compressor.

The experiment has several objectives: 1) to increase physical "mixing" in the lake and create a less favorable environment for the blue-green algae; 2) to increase conditions for growth of competitive algae; 3) to discover whether the experiment causes too much disturbance to the lake bottom which could deplete oxygen available to trout; and 4) to study whether this would be a viable method to treat the entire lake.

For the experiment to be most informative, algae levels must remain high in the lake. Preparations are made to install the device Aug. 12. However, if algae levels decline prior to then, the study will consist of testing the bottom disturbance associated with aeration. The enclosure study in some form would then take place in summer 2003.

This is just one technique available to deal with high amounts of toxin-producing algae, but one we think is worth further study. Representative Morgan and the agencies involved in this study and in the future of the lake are concerned with Diamond Lake's water quality issues. Public health and safety is important to us.

We believe that by working together and combining our knowledge and expertise with that of independent scientists, we will better understand the complex web that creates Diamond Lake's ecology and find a solution that works.

We invite the public's questions and comments on this experimental study. James Caplan, Umpqua National Forest Supervisor, 541/672-6601 and Steve Denney, Oregon Department of Fish and Wildlife, Southwest Regional Manager, 541/440-3353.

The U.S. Fish and Wildlife Service has officially terminated the Environmental Impact Statement process it began two years ago to review a proposal from the Oregon Department of Fish and Wildlife to treat Diamond Lake with the fish toxicant rotenone.

State fish and wildlife officials sent the Service a letter on August 30, 2001, saying the Oregon Fish and Wildlife Commission had directed them to withdraw the proposal. State fish and wildlife officials had discussed using rotenone at Diamond Lake since 1996, when they realized the lake’s popular trout fishery had been destroyed by an overpopulation of tui chub. The tui chub out-competed the stocked rainbow trout for the limited food base.

The Service was required to do an EIS because the state proposed to finance the tui chub control project with money from the Service’s Federal Aid in Sport Fish Restoration program, supported by taxes on fishing equipment and motorboat fuel sold nationwide. All Federal Aid projects must go through reviews required by the National Environmental Policy Act, which includes the EIS process, the most complicated of the reviews.

“When we started this EIS we had no idea that the obstacles were apparently so insurmountable,” said Jerry Novotny, a Federal Aid representative for the Service. “But the process worked. Some may not agree, but without the EIS process, some of the issues that arose likely would not have been considered.”

The state’s plans for the lake were affected by a combination of issues, including: the effects of nutrient-laden lake discharges on downstream water quality; impacts on Lake Creek from pumping water out of Diamond Lake; effects on listed species in the Umpqua River watershed; consistency with the objectives of the Northwest Forest Plan; and cost, estimated to be $3 million to $4 million.   

State fish and wildlife officials will compile the information gathered thus far in the EIS process and use it to develop future management strategies for Diamond Lake.

Information about Diamond Lake and its future management should be directed to Steve Denny or Dave Loomis of the Oregon Department of Fish and Wildlife office in Roseburg, Oregon, 541-440-3353.

ROSEBURG – The Oregon Department of Fish and Wildlife stocked Diamond Lake today with 2,500 two-pound rainbow trout from Desert Springs Hatchery. The trout were stocked after ODFW biologists determined enough oxygen exists in the lake to support the fish.

The recent algae bloom in the lake is breaking up, and biologists say it's safe to stock these large rainbows. "We sampled the lake last week and found oxygen levels were higher and temperatures were cooler," said Dave Loomis, Umpqua District Fish Biologist. "We'll continue monitoring through October, and will release another 2,500 two-pound trout next week."

ROSEBURG – The Oregon Department of Fish and Wildlife has been given funds from the Oregon Legislature to continue stocking fish and conducting experiments on Diamond Lake fisheries. The lake's ecology has been compromised since the early 1990s when tui chub were illegally introduced, probably as live bait fish. Millions of chub now populate the lake, drastically reducing survival and growth of rainbow trout by out-competing them for depleted zooplankton and insect populations.

The Oregon Legislature gave ODFW $200,000 in General Fund dollars to be used in conjunction with $25,000 that was remaining in the Freshwater Program from the 1999-01 biennium. ODFW has been directed to use these funds to purchase and stock large rainbow trout in Diamond Lake , experiment with stocking other fish species, and document and compile all existing data and analysis associated with development of an Environmental Impact Statement (EIS).

In the spring of 1999, ODFW began developing the EIS with the U.S. Fish and Wildlife Service (USFWS) and the U.S. Forest Service (FS). ODFW proposed to use federal Sport Fish Restoration dollars to help fund a solution to the Diamond Lake tui chub problem. A final EIS will not be issued at this time.

"ODFW's preferred alternative in the draft stages of the EIS was to rotenone Diamond Lake to eradicate chub, which would recover the trout fishery and health of the

lake," said Dave Loomis, Roseburg district fish biologist. "While working on the EIS, we discovered a high probability of conflict with existing laws and policies, including the Clean Water Act. These conflicts made it unlikely that the proposed action could be implemented."

Through evaluations done by ODFW, the USFWS, and the FS, the agencies concluded that increased nutrient levels occurring in and downstream of the lake would be further degraded in the short-term by nearly any alternative, including the "no action," and therefore, not comply with some federal and state laws. The team also found that the "area of concern" for project alternatives was much larger than anticipated.

"Even though we didn't make a final decision, it was a process of discovery," said Jerry Novotny, Federal Aid Staff Biologist, USFWS. "We explored options the public voiced, including experimenting with removing tui chub mechanically, and evaluated a lot of data on the lake, surrounding area, and its ecology. We realized the project was very complex from the start, and the USFWS and ODFW wanted to make sure the process matched the extent of the environmental issues and the public's interest in this lake."

To maintain fishery levels seen in 2000 and 2001 from ODFW's aggressive stocking plan, the legislature directed the agency to purchase 30,000 trophy-sized rainbow trout from private hatcheries. The lake will also receive releases of spring chinook, other rainbow trout stocks and/or brown trout as an experiment for 2002. "We'll start to take a look at which species and sizes of fish can survive and effectively compete with tui chub," Loomis said, "and evaluate whether a different stocking program should be continued in 2003."

Because of this new direction, ODFW managers will ask the Fish and Wildlife Commission to temporarily suspend the management objectives of Diamond Lake while an experimental fishery is established and evaluated. Currently, ODFW's goal is to provide 100,000 days of angling opportunity and a harvest of 270,000 rainbow trout annually. These goals cannot be met with tui chub in the lake.

ROSEBURG – Members of the media are invited to spend a day at Diamond Lake observing the Oregon Department of Fish and Wildlife (ODFW) and commercial fishermen experiment with different methods of mechanically removing tui chub.  Several local legislators also were invited to this event.
          
We will meet at Diamond Lake Resort (Lodge building) at 8 a.m. on Wednesday, July 19, and board pontoon boats to see the operations up close.  Be prepared for Cascade Mountain weather, and remember to bring bug repellent and sunscreen.  Because we need an accurate count to reserve boats, you must RSVP to Meghan Collins by close of business on Monday, July 17 at 541/440-3353.  Plan to spend a half-day at the lake.

ODFW, the U.S. Fish and Wildlife Service, and the Forest Service have been working on a Draft Environmental Impact Statement to address the loss of Diamond Lake's rainbow trout fishery. The fishery has declined since the illegal introduction of tui chub into the lake in the late 1980s or early 1990s. Tui chub now number in the millions. More information