Grantsville Reservoir
Today’s report
Grantsville Reservoir is a fair bet today. The reservoir is 36% full as of September 30 (the operator posts a month-end level, not daily), above the usual 24% for this time of year, and drawing down over the last month. The DWR last stocked rainbow trout (2,720 fish) on October 7. Overnight's forecast: partly cloudy, 48°F.
- pool is low (~36% of capacity as of Sep 30)
- stocked 11 days ago
- calm, fishable weather
Current conditions
Stocking
Last stocked Oct 7, 2026 — rainbow trout (2,720 fish).
| Date | Species | Quantity | Avg length |
|---|---|---|---|
| Oct 7, 2026 | rainbow trout | 2,720 | 11.6" |
| Oct 7, 2026 | rainbow trout | 1,360 | 11.6" |
| Oct 1, 2026 | rainbow trout | 3,000 | 9.66" |
| Jun 23, 2026 | rainbow trout | 819 | 12.44" |
| Jun 8, 2026 | rainbow trout | 2,380 | 12.13" |
| May 26, 2026 | rainbow trout | 1,959 | 11.86" |
| May 18, 2026 | rainbow trout | 2,304 | 12.02" |
| May 11, 2026 | rainbow trout | 2,240 | 12.13" |
Best time to fish Grantsville Reservoir
The DWR has stocked Grantsville Reservoir 74 times over the last 6 seasons, and 50% of those plants landed in April, May, September — 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
- No limit for smallmouth bass. Anglers must not release any bass they catch. All bass must be immediately killed.
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.