Mammoth Creek
Garfield County · Southern region — Headwater of the Sevier near Hatch.
Current conditions
10.1 cfs
Flow (steady)
9–11 cfs
72-hr range
Flow as of Aug 19, 1:45 PM MT · USGS 10173450
Stocking
Last stocked Jun 23, 2026 — rainbow (242 fish).
| Date | Species | Quantity | Avg length |
|---|---|---|---|
| Jun 23, 2026 | rainbow | 242 | 10.54" |
| May 20, 2026 | tiger trout | 500 | 10.19" |
| May 18, 2026 | rainbow | 260 | 10.12" |
| May 6, 2026 | brown trout | 3,046 | 3.28" |
| Jul 8, 2025 | rainbow | 251 | 10.51" |
| Jun 4, 2025 | tiger trout | 511 | 9.21" |
| May 28, 2025 | rainbow | 252 | 10.21" |
| May 28, 2025 | brown trout | 3,780 | 4.11" |
Species
brown troutrainbow trout
Forecast
This Afternoon
80°F
Mostly Sunny
Tonight
55°F
Partly Cloudy
Thursday
80°F
Sunny then Slight Chance Showers And Thunderstorms
17% precip
Thursday Night
56°F
Partly Cloudy
Friday
77°F
Partly Sunny then Showers And Thunderstorms
76% precip
Friday Night
54°F
Slight Chance Showers And Thunderstorms then Mostly Cloudy
23% precip
Saturday
75°F
Partly Sunny then Chance Showers And Thunderstorms
26% precip
Saturday Night
54°F
Partly Cloudy