Gem Lake (Z-18) fishing
Gem Lake (Z-18) was last stocked on July 23, 2026 with 200 brook trout (3.0 in. average), according to the Utah DWR fish stocking report. It is a lake in Duchesne County, Utah. From 2021 to 2026, DWR stocked 608 fish here, the 209th most of 263 stocked waters in Duchesne County.
Recent stockings at Gem Lake (Z-18)
- July 23, 2026200 brook trout, 3.0 in. average
- July 3, 2024204 brook trout, 2.9 in. average
- June 27, 2022204 brook trout, 2.8 in. average
- July 9, 2019297 tiger trout, 2.6 in. average
- July 14, 2016297 tiger trout, 3.6 in. average
- July 8, 2013297 tiger trout, 3.1 in. average
Newest first, from the Utah DWR stocking report. Full stocking history.
Gem Lake (Z-18) facts
- Last stocked
- July 23, 2026 (110 days ago): 200 brook trout
- Stockings in 2026
- 1 (200 fish): 200 brook trout
- County
- Duchesne County
- Stocked since 2021
- brook trout
- Average size stocked
- 2.9 in. (2021 to 2026)
- County rank
- 209th most fish of 263 stocked waters in Duchesne County since 2021
- Name in DWR report
- GEM L Z-18
- Nearest water
- Joan Lake (Z-19), 0.4 mi
- Rules
- Statewide rules (no water-specific entry in the 2026 guidebook)
Gem Lake (Z-18) stocking report, last 12 months
| July 23, 2026 | Brook trout | 200 | 3.0 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.
Gem Lake (Z-18) stocking profile
- First record in the DWR report: July 2, 2003. Since then DWR has logged 10 stockings here in 10 different years, 3,001 fish in all.
- Species stocked 2021 to 2026, by share of fish: brook trout 100% (608 fish).
- Busiest months in the record: July (90% of records) and June (10% of records).
- Stocked fish averaged 2.9 in. from 2021 to 2026 (per-record averages ranged from 2.8 to 3.0 in.).
- Fish stocked 2021 to 2026: 608, the 209th most of 263 stocked waters in Duchesne County and 894th of 1,076 statewide.
- Nearest other water with a page: Joan Lake (Z-19), 0.4 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 Gem Lake (Z-18) stocked?
Stocked in 2 of the last 5 years (2021 to 2025). We show a pattern only when a water was stocked in at least 3 of the last 5 years, so this page shows the stocking history only.
DWR does not publish stocking schedules. How we read stocking patterns.
Gem Lake (Z-18) stocking history by year
| Year | Records | Fish | Avg. length | Species |
|---|---|---|---|---|
| 2026 | 1 | 200 | 3.0 in. | Brook trout |
| 2024 | 1 | 204 | 2.9 in. | Brook trout |
| 2022 | 1 | 204 | 2.8 in. | Brook trout |
| 2019 | 1 | 297 | 2.6 in. | Tiger trout |
| 2016 | 1 | 297 | 3.6 in. | Tiger trout |
| 2013 | 1 | 297 | 3.1 in. | Tiger trout |
| 2010 | 1 | 293 | 2.3 in. | Tiger trout |
| 2007 | 1 | 398 | 3.2 in. | Brook trout |
| 2004 | 1 | 408 | 2.5 in. | Brook trout |
| 2003 | 1 | 403 | 2.6 in. | Brook trout |
All stocking records 2021 to Nov. 10, 2025 (2)
| July 3, 2024 | Brook trout | 204 | 2.9 in. |
| June 27, 2022 | Brook trout | 204 | 2.8 in. |
Fishing rules
No water-specific entry for Gem Lake (Z-18) 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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Gem Lake (Z-18) questions
When was Gem Lake (Z-18) last stocked?
The most recent stocking in the DWR report is dated July 23, 2026: 200 brook trout.
What fish are in Gem Lake (Z-18)?
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.