Mammoth Creek
Recent Guide Reports
Current Conditions
Gauge Flow
High Water Warning
Gauge Height
Water Temperature
Water Temperature Over 68°F
Condition Graphs
Fly Shop Directory
Recent Guide Reports
Nov 20
Utah DWR
<b>Access:</b> is limited in lower Mammoth Creek by private land that is posted closed to trespassing. Please respect private property rights and obey signs and other postings.
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<b>Winter Forecast (December-March):</b> Surface ice often makes fishing a little difficult in lower Mammoth Creek, Asay Creek, and the upper Sevier River. Target warm, sunny days when the ice breaks up. You can find fair to good success for brown trout on those days with a variety of lures and flies. Winter is also a good time to target whitefish with nymphs as they congregate in deep pools. Access is difficult in upper Mammoth Creek due to snow and ice.
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<b>Native Cutthroat Trout Restoration:</b> We treated the upper Mammoth Creek drainage with rotenone in 2020 and 2021 to remove nonnative trout, in preparation for restoring native Bonneville cutthroat trout upstream of Mammoth Spring. (The project did not affect the stream below Mammoth Spring). Bonneville cutthroat trout have been stocked now for a couple of years, but they were stocked at fingerling fish and while growing, some will take a couple years to get up to catchable size. Castle Creek (Sidney Valley) was restored a few years ago and has good numbers of chunky cutthroat trout, as well as a handful of tiger trout. Some catchable-sized tiger trout were stocked in upper Mammoth Creek last summer.
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<b>Winter Forecast (December-March):</b> Surface ice often makes fishing a little difficult in lower Mammoth Creek, Asay Creek, and the upper Sevier River. Target warm, sunny days when the ice breaks up. You can find fair to good success for brown trout on those days with a variety of lures and flies. Winter is also a good time to target whitefish with nymphs as they congregate in deep pools. Access is difficult in upper Mammoth Creek due to snow and ice.
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<b>Native Cutthroat Trout Restoration:</b> We treated the upper Mammoth Creek drainage with rotenone in 2020 and 2021 to remove nonnative trout, in preparation for restoring native Bonneville cutthroat trout upstream of Mammoth Spring. (The project did not affect the stream below Mammoth Spring). Bonneville cutthroat trout have been stocked now for a couple of years, but they were stocked at fingerling fish and while growing, some will take a couple years to get up to catchable size. Castle Creek (Sidney Valley) was restored a few years ago and has good numbers of chunky cutthroat trout, as well as a handful of tiger trout. Some catchable-sized tiger trout were stocked in upper Mammoth Creek last summer.
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