Rainbow Trout Stocked · 39 plants · last May 30, 2025 Best: dawn, dusk Matt Warner Reservoir fishing
Matt Warner Reservoir fishing is stocked with Rainbow Trout, Tiger Trout, Brown Trout, and Grass Carp on a reservoir. It is stocked about 5.3 times a year since 2016, most often in May and June. Species guides list dawn and dusk for Rainbow Trout and Tiger Trout and dawn, day, and dusk for Brown Trout.
- Last stocked
- May 27, 2026
- · Brown Trout
- Plants on record
- 58
- Since 2016
- Species recorded
- 4
- Average size
- 5.3 in
- Elevation
- 7,546 ft
Fish at Matt Warner Reservoir
Around the dates Matt Warner Reservoir is stocked, Open-Meteo's 2016-2025 archive puts mean air temperature at 45.8°F in May, 60.3°F in June, 34.6°F in April, 40.4°F in October. That is air temperature at these coordinates, not water temperature. Open-Meteo
Rainbow Trout Stocked · 39 plants · last May 30, 2025 Best: dawn, dusk 
Brown Trout Stocked · 10 plants · last May 27, 2026 Best: dawn, day, dusk 
Tiger Trout Stocked · 6 plants · last June 30, 2025 Best: dawn, dusk Grass Carp Stocked · 3 plants · last May 18, 2025
Last stocked May 18, 2025 · avg 7.9 in · 3 plants
Matt Warner Reservoir, located on Diamond Mountain, offers very productive waters that grow large trout. Fishery management strategies for these lakes include opportunity for family-oriented fishing and catch and release trophy. (wri.utah.gov, accessed October 5, 2026)
Drafted by AI from the cited sources and checked before publishing.
How Matt Warner Reservoir is stocked
Flaming Gorge Reservoir (12.2 mi), Red Fleet Reservoir (14.9 mi), Steinaker Reservoir (21.4 mi), Hoop Lake (44.1 mi), and Browns Draw Reservoir (49.4 mi) were stocked more recently. Flaming Gorge Reservoir is also stocked with Brown Trout, Rainbow Trout, and Tiger Trout, Red Fleet Reservoir is also stocked with Tiger Trout, Rainbow Trout, and Brown Trout, Steinaker Reservoir is also stocked with Brown Trout, Rainbow Trout, and Tiger Trout, Hoop Lake is also stocked with Rainbow Trout and Tiger Trout, and Browns Draw Reservoir is also stocked with Tiger Trout, Rainbow Trout, and Brown Trout.
Fish stocked in 2016
58,211
Fish stocked in 2017
78,376
Fish stocked in 2018
80,522
Fish stocked in 2019
61,045
Fish stocked in 2020
83,549
Fish stocked in 2021
48,493
Fish stocked in 2022
51,592
Fish stocked in 2023
41,459
Fish stocked in 2024
39,714
Fish stocked in 2025
50,370
Fish stocked in 2026
3,929
Stocking history
| Date | Species | Quantity | Avg. length | Source |
|---|---|---|---|---|
| May 27, 2026 | Brown Trout | 3,929 | 3.12 in | report |
| June 30, 2025 | Tiger Trout | 2,474 | 4.32 in | report |
| May 30, 2025 | Rainbow Trout | 33,042 | 2.67 in | report |
| May 18, 2025 | Grass Carp | 380 | 6.75 in | report |
| May 13, 2025 | Rainbow Trout | 1,724 | 3.96 in | report |
| May 13, 2025 | Brown Trout | 5,747 | 2.96 in | report |
| May 12, 2025 | Rainbow Trout | 4,099 | 9.28 in | report |
| May 8, 2025 | Rainbow Trout | 2,904 | 9.16 in | report |
| June 3, 2024 | Brown Trout | 5,249 | 2.44 in | report |
| May 30, 2024 | Rainbow Trout | 3,877 | 9.25 in | report |
| May 20, 2024 | Rainbow Trout | 10,598 | 3.89 in | report |
| May 16, 2024 | Grass Carp | 325 | 10 in | report |
| May 15, 2024 | Rainbow Trout | 7,787 | 3.49 in | report |
| May 15, 2024 | Rainbow Trout | 11,878 | 3.52 in | report |
| June 1, 2023 | Brown Trout | 5,238 | 2.17 in | report |
| June 1, 2023 | Rainbow Trout | 2,998 | 8.96 in | report |
| June 1, 2023 | Rainbow Trout | 998 | 9.16 in | report |
| May 31, 2023 | Rainbow Trout | 32,225 | 3.7 in | report |
| May 13, 2022 | Rainbow Trout | 758 | 8.63 in | report |
| May 13, 2022 | Rainbow Trout | 504 | 11.75 in | report |
| May 13, 2022 | Rainbow Trout | 12,984 | 3.12 in | report |
| May 13, 2022 | Brown Trout | 7,050 | 2.3 in | report |
| May 5, 2022 | Grass Carp | 305 | 7.09 in | report |
| April 28, 2022 | Rainbow Trout | 29,991 | 2.76 in | report |
| June 1, 2021 | Rainbow Trout | 10,150 | 2.96 in | report |
| June 1, 2021 | Rainbow Trout | 6,853 | 2.24 in | report |
| May 22, 2021 | Rainbow Trout | 8,190 | 2.82 in | report |
| May 22, 2021 | Brown Trout | 7,800 | 2.82 in | report |
| April 29, 2021 | Rainbow Trout | 15,500 | 2.92 in | report |
| May 30, 2020 | Brown Trout | 9,450 | 2.77 in | report |
| May 21, 2020 | Rainbow Trout | 3,759 | 8.48 in | report |
| May 21, 2020 | Rainbow Trout | 3,759 | 8.48 in | report |
| May 21, 2020 | Rainbow Trout | 3,759 | 8.48 in | report |
| May 21, 2020 | Rainbow Trout | 3,759 | 8.48 in | report |
| May 19, 2020 | Rainbow Trout | 275 | 13.15 in | report |
| May 4, 2020 | Rainbow Trout | 40,016 | 3.12 in | report |
| May 4, 2020 | Brown Trout | 8,836 | 2.48 in | report |
| May 1, 2020 | Rainbow Trout | 9,936 | 3.01 in | report |
| May 31, 2019 | Rainbow Trout | 49,995 | 2.59 in | report |
| May 31, 2019 | Brown Trout | 2,030 | 2.7 in | report |
| May 31, 2019 | Tiger Trout | 9,020 | 2.67 in | report |
| May 17, 2018 | Rainbow Trout | 500 | 13.25 in | report |
| May 11, 2018 | Tiger Trout | 9,460 | 2.96 in | report |
| May 11, 2018 | Rainbow Trout | 999 | 8.34 in | report |
| May 7, 2018 | Rainbow Trout | 14,914 | 8.05 in | report |
| April 30, 2018 | Rainbow Trout | 25,075 | 3.09 in | report |
| April 25, 2018 | Rainbow Trout | 25,110 | 3 in | report |
| April 13, 2018 | Brown Trout | 4,464 | 3 in | report |
| November 6, 2017 | Rainbow Trout | 6,165 | 8.51 in | report |
| October 17, 2017 | Rainbow Trout | 3,815 | 8.06 in | report |
| October 3, 2017 | Rainbow Trout | 440 | 11.06 in | report |
| June 7, 2017 | Tiger Trout | 8,970 | 3.56 in | report |
| May 10, 2017 | Rainbow Trout | 29,952 | 2.89 in | report |
| April 28, 2017 | Tiger Trout | 8,944 | 3.11 in | report |
| April 28, 2017 | Rainbow Trout | 20,090 | 3.12 in | report |
| June 1, 2016 | Rainbow Trout | 29,970 | 3.03 in | report |
| May 23, 2016 | Tiger Trout | 8,816 | 2.99 in | report |
| May 23, 2016 | Rainbow Trout | 19,425 | 2.88 in | report |
Access and facts
- Water type
- reservoir
- Nearest town
- Vernal
- Shore access
- Yes
- Boat ramp
- Yes
- Facilities
- camping, restrooms
Sits high on Diamond Mountain, roughly 25 miles north of Vernal in Uintah County. A public boat ramp off Browns Park Road is managed by the State of Utah, and Utah DWR calls it a popular camping and fishing destination among the Diamond Mountain lakes.
Drafted by AI from the cited sources and checked before publishing.
Advisories, closures, regulations and water conditions change. Check the Utah Division of Wildlife Resources before you go.
About Matt Warner Reservoir
According to the Utah Division of Wildlife Resources, the Diamond Mountain lakes were categorized as Blue Ribbon fisheries for well over a decade. They believe that if technology can be utilized to help fisheries through weak water years, these lakes have the full potential to realize Blue Ribbon status once again. (wri.utah.gov, accessed October 5, 2026)
Drafted by AI from the cited sources and checked before publishing.
Nearest lakes
Common questions
What fish are at Matt Warner Reservoir?
Fishing Matt Warner Reservoir usually means Rainbow Trout: Rainbow Trout accounts for 39 of 58 plants on record, ahead of Brown Trout and 2 more. Rainbow Trout was last stocked May 30, 2025, averaging 6 in. Brown Trout was last stocked May 27, 2026, averaging 2.7 in. Tiger Trout was last stocked June 30, 2025, averaging 3.3 in. Grass Carp was last stocked May 18, 2025, averaging 7.9 in.
When is Matt Warner Reservoir stocked?
Last stocked May 27, 2026. It is stocked about 5.3 times a year since 2016, most often in May and June.
How big are the fish stocked at Matt Warner Reservoir?
Stocked fish average 5.3 in. Rainbow Trout average 6 in. Brown Trout average 2.7 in. Tiger Trout average 3.3 in. Grass Carp average 7.9 in.
How do you get on Matt Warner Reservoir?
Shore fishing is available and there is a boat ramp. The nearest town is Vernal. Facilities include camping and restrooms. Sits high on Diamond Mountain, roughly 25 miles north of Vernal in Uintah County. A public boat ramp off Browns Park Road is managed by the State of Utah, and Utah DWR calls it a popular camping and fishing destination among the Diamond Mountain lakes.
Which lakes near Matt Warner Reservoir were stocked more recently?
Flaming Gorge Reservoir (12.2 mi), Red Fleet Reservoir (14.9 mi), Steinaker Reservoir (21.4 mi), Hoop Lake (44.1 mi), and Browns Draw Reservoir (49.4 mi) were stocked more recently. Flaming Gorge Reservoir is also stocked with Brown Trout, Rainbow Trout, and Tiger Trout, Red Fleet Reservoir is also stocked with Tiger Trout, Rainbow Trout, and Brown Trout, Steinaker Reservoir is also stocked with Brown Trout, Rainbow Trout, and Tiger Trout, Hoop Lake is also stocked with Rainbow Trout and Tiger Trout, and Browns Draw Reservoir is also stocked with Tiger Trout, Rainbow Trout, and Brown Trout.