Upper Stillwater Reservoir fishing
Upper Stillwater Reservoir was last stocked on Aug. 12, 2026 with 761 brook trout (5.1 in. average), according to the Utah DWR fish stocking report. It is a reservoir in Duchesne County, Utah. From 2021 to 2026, DWR stocked 20,125 fish here, the 12th most of 258 stocked waters in Duchesne County.
Upper Stillwater Reservoir stocking report, last 12 months
| Aug. 12, 2026 | Brook trout | 761 | 5.1 in. |
| July 16, 2026 | Brook trout | 7,319 | 3.5 in. |
| June 2, 2026 | Brook trout | 3,004 | 3.1 in. |
Source: Utah DWR fish stocking report. Stocking data fetched Sept. 25, 2026; newest record dated Sept. 23, 2026. DWR posts stockings after they happen and does not publish schedules.
When is Upper Stillwater Reservoir stocked?
Based on DWR stocking records, 2021 to 2025. Stocked in 3 of those 5 years.
Stocking dates moved around from year to year, so no single window repeats in 3 or more of the last 5 years.
2025 stocking: 1 record, first on June 13.
DWR does not publish stocking schedules. Patterns are based on past stocking records and are not a promise of future stocking. Weather, water conditions and hatchery supply change plans. How we read patterns.
Upper Stillwater Reservoir stocking profile
- First record in the DWR report: May 16, 2014. Since then DWR has logged 9 stockings here in 7 different years, 30,437 fish in all.
- Species stocked 2021 to 2026, by share of fish: brook trout 100% (20,125 fish).
- Busiest months in the record: July (44% of records) and August (22% of records).
- Stocked fish averaged 3.6 in. from 2021 to 2026 (per-record averages ranged from 3.1 to 5.1 in.).
- Fish stocked 2021 to 2026: 20,125, the 12th most of 258 stocked waters in Duchesne County and 227th of 1,068 statewide.
- Nearest other water with a page: Fern Lake (X-5), 4.5 mi away.
Computed from Utah DWR stocking records (fish counts and average lengths as DWR reports them). Past stocking is history, not a schedule.
Upper Stillwater Reservoir stocking history by year
| Year | Records | Fish | Avg. length | Species |
|---|---|---|---|---|
| 2026 | 3 | 11,084 | 3.5 in. | Brook trout |
| 2025 | 1 | 3,001 | 3.6 in. | Brook trout |
| 2024 | 1 | 3,036 | 4.7 in. | Brook trout |
| 2023 | 1 | 3,004 | 3.1 in. | Brook trout |
| 2020 | 1 | 3,480 | 3.7 in. | Brook trout |
| 2015 | 1 | 5,984 | 4.6 in. | Tiger trout |
| 2014 | 1 | 848 | 9.2 in. | Rainbow trout |
All stocking records 2021 to Sept. 24, 2025 (3)
| June 13, 2025 | Brook trout | 3,001 | 3.6 in. |
| Aug. 19, 2024 | Brook trout | 3,036 | 4.7 in. |
| July 19, 2023 | Brook trout | 3,004 | 3.1 in. |
Fishing rules
The 2026 Utah Fishing Guidebook lists no water-specific rules for Upper Stillwater Reservoir under that name, so statewide rules apply unless DWR posts a change. Some waters are covered by a group entry (for example a drainage or its tributaries).
Rules summarized in our own words from the 2026 Utah Fishing Guidebook. DWR can change rules mid-year: check the current guidebook and its updates at wildlife.utah.gov/guidebooks before fishing. See statewide limits.
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"Was stocked" alerts come from new rows in the DWR stocking report. "Often stocked around now" heads-ups come from past stocking records only. DWR does not publish stocking schedules, so a heads-up is never a promise. We store your email only for these alerts; ask us to delete it at [email protected]. Privacy.
Upper Stillwater Reservoir questions
When was Upper Stillwater Reservoir last stocked?
The most recent stocking in the DWR report is dated Aug. 12, 2026: 761 brook trout.
What fish are in Upper Stillwater Reservoir?
Since 2021 DWR has stocked brook trout.
What are the fishing limits at Upper Stillwater Reservoir?
The 2026 guidebook lists no water-specific rules under this name, so statewide limits apply unless DWR posts a change. See our statewide limits page and check the guidebook.
Stocking: Utah DWR fish stocking report, fetched Sept. 25, 2026. Location: Utah DWR, USGS NHD. Rules: 2026 Utah Fishing Guidebook. Page built Sept. 24, 2026. Found an error? [email protected]. Verify rules with DWR before fishing.