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Project #64222
Key Info:
USDA/Forest Service
Title of Action:
Bonneville Cutthroat Trout Restoration
Federal ID:
Project Start Date:
(T36S, R8W, Sections 5, 6, 7, 8, 14, 15, 16, 17, 21 22, 23, 26 and 27, Salt Lake City Baseline and
Location/Supplemental Attachment:

Bonneville Cutthroat Trout Restoration.pdf
Has local government been contacted?
Date Local Government was Contacted:
Date of Acquisition:
Have the state representative and state senator been contacted?

Project abstract: Temporary closure of Castle Creek
The Utah Division of Wildlife Resources will conduct a native
Bonneville cutthroat trout restoration project using the piscicide rotenone within the Mammoth Creek drainage on the Dixie National Forest, beginning July 31, 2018.
The project is consistent with the conservation strategy for the species, which is designed to prevent the fish from being listed under the Endangered Species Act. The rotenone treatment is aimed to rid
all species of fish in targeted streams, ponds, lakes and tributaries in order to restore the native Bonneville cutthroat trout to a portion of the Mammoth Creek drainage.
A temporary closure of these areas during the piscicide application will be necessary to allow ground crews to safely work in and around the lakes and streams without harm or injury to the public. All use
of the water (wading, fishing, swimming, etc.) within the project area will be prohibited during piscicide application and neutralization.
Mammoth Creek is one of the primary tributaries of the Sevier River. In 2012, genetic testing confirmed that upper Mammoth Creek has a remnant population of native Bonneville cutthroat trout, the only known remnant population in the entire Upper Sevier River drainage. Finding this native population is significant because despite the competition with the non-native fish, the Bonneville cutthroat have continued to survive, said Angelita Bulletts, Forest Supervisor.
Restoring Bonneville cutthroat trout in Mammoth Creek will help to improve the status of the species, the ecology of the stream and the quality of recreational fishing, said Mike Golden, Dixie National
Forest, Fish Biologist.
The first and second phases of the project occurred in 2015 and 2016 when two of Mammoth Creek s tributaries Castle Creek and Lowder Creek were chemically treated to remove non-native brook
trout. Groundwater inflows and complex habitat in Castle Valley reduced effectiveness in 2015 so a third treatment of this area is necessary in 2018. The treatment area extends from the headwaters of Castle Creek from Sydney Valley, downstream to the stream s confluence with Mammoth Creek.
Liquid rotenone (product name: Prenfish) will be applied to target waters using drip barrels. The drips will be set during the morning and they ll run through the afternoon.
Depending on their location, most drips will run for three to eight hours. Applying the rotenone this way will ensure that all of the fresh water sources are simultaneously treated. Charges for drip stations are calculated to apply the five percent active ingredient liquid rotenone at a concentration of 1.5 parts per million in the target area.
After the rotenone has been applied, potassium permanganate, an oxidizing agent, will be applied to treated waters below the target area to deactivate the rotenone in those areas.
The active ingredient in liquid rotenone is a powder derived from the roots of South American plant. Rotenone is specifically poisonous to gilled organisms because it interrupts oxygen uptake from the
water at the cellular level. After the rotenone has been applied, potassium permanganate, an oxidizing agent, will be applied to treated waters below the target area to neutralize the rotenone in those areas. Although liquid rotenone is relatively benign to humans, fish treated with the chemical have not been cleared by the Food and Drug Administration for human consumption. For that reason,
fish that die during the project cannot be salvaged.
After successful removal of non-native trout, Bonneville cutthroat trout will be introduced to the stream. Similar restoration projects involving Utah s native trout are underway throughout the state. The projects are part of conservation strategies designed to prevent the fish from being listed under the Endangered Species Act.
The 2018 area closure for Castle Creek is Pursuant to Title 36 Code of Federal Regulations 261.50 (a) and (b), the following areas will be closed during the treatments for protection of public health and safety:
Within 100 feet of Castle Creek and its tributaries from the confluence of Castle Creek with Mammoth Creek upstream through all Castle Creek drainage headwaters and the Deer Creek ditch conveyance.
The temporary closure order is anticipated to be cancelled August 2, 2018 for the Castle Creek
project area.
How is the local government(s) likely to be impacted? NA
Possible significant impacts likely to occur: NA
Consistency Review No Consistency Review Document
Record of Decision No Record of Decision Document
State Comments No State Comments

For further information please contact project sponsor.