Big Sandwash Reservoir
Today’s report
Big Sandwash Reservoir is fishing tough today. The reservoir is 12% full as of September 30 (the operator posts a month-end level, not daily), well below the usual 21% for this time of year, and rising over the last month. The DWR last stocked walleye (425 fish) on July 16. This Afternoon's forecast: sunny, 56°F.
- drawn down to ~12% of capacity as of Sep 30 — expect mudflats and long walks to the water
- calm, fishable weather
Current conditions
Stocking
Last stocked Jul 16, 2026 — walleye (425 fish).
| Date | Species | Quantity | Avg length |
|---|---|---|---|
| Jul 16, 2026 | walleye | 425 | 4.58" |
| May 21, 2026 | rainbow trout | 400 | 13.1" |
| May 19, 2026 | rainbow trout | 948 | 11.75" |
| May 18, 2026 | rainbow trout | 1,120 | 11.6" |
| Oct 29, 2025 | cutbow (cutthroat × rainbow hybrid) | 7,453 | 4.55" |
| Jun 1, 2025 | rainbow trout | 4,913 | 9.6" |
| May 24, 2025 | rainbow trout | 4,960 | 9.69" |
| May 17, 2025 | rainbow trout | 3,169 | 9.54" |
Best time to fish Big Sandwash Reservoir
The DWR has stocked Big Sandwash Reservoir 25 times over the last 5 seasons, and 84% of those plants landed in March, May, November — the freshest fish and the easiest bite usually follow within a week or two of a stocking.
Species
Location
Nearby waters (within ~25 mi):
Regulations
- Limit 10 yellow perch and 20 walleye (no size restrictions).
Special rules from the 2026 Utah Fishing Guidebook. Statewide daily limits apply to anything not listed. Rules change — always verify in the current guidebook before you fish.