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 14th most of 263 stocked waters in Duchesne County.
Recent stockings at Upper Stillwater Reservoir
- Aug. 12, 2026761 brook trout, 5.1 in. average
- July 16, 20267,319 brook trout, 3.5 in. average
- June 2, 20263,004 brook trout, 3.1 in. average
- June 13, 20253,001 brook trout, 3.6 in. average
- Aug. 19, 20243,036 brook trout, 4.7 in. average
- July 19, 20233,004 brook trout, 3.1 in. average
Newest first, from the Utah DWR stocking report. Full stocking history.
Upper Stillwater Reservoir facts
- Last stocked
- Aug. 12, 2026 (90 days ago): 761 brook trout
- Stockings in 2026
- 3 (11,084 fish): 11,084 brook trout
- County
- Duchesne County
- Stocked since 2021
- brook trout
- Average size stocked
- 3.6 in. (2021 to 2026)
- County rank
- 14th most fish of 263 stocked waters in Duchesne County since 2021
- Name in DWR report
- UPPER STILLWATER RES
- Nearest water
- Fern Lake (X-5), 4.5 mi
- Rules
- Statewide rules (no water-specific entry in the 2026 guidebook)
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 Nov. 10, 2026; newest record dated Nov. 19, 2026. DWR posts stockings after they happen and does not publish schedules.
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 14th most of 263 stocked waters in Duchesne County and 230th of 1,076 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.
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. This is past stocking, not a promise. How we read patterns.
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 Nov. 10, 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
No water-specific entry for Upper Stillwater Reservoir in the 2026 guidebook: statewide limits apply unless a group entry (such as a drainage) covers it.
From the 2026 Utah Fishing Guidebook, in our own words. Rules can change mid-year: check wildlife.utah.gov/guidebooks before fishing.
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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.
Stocking: Utah DWR fish stocking report, fetched Nov. 10, 2026. Location: Utah DWR, USGS NHD. Rules: 2026 Utah Fishing Guidebook. Page built Nov. 10, 2026. Found an error? Tell us. Verify rules with DWR before fishing.