Brown Trout Stocked · 12 plants · last October 2025 Best: dawn, day, dusk Gray Reef Reservoir fishing
Gray Reef Reservoir fishing is stocked with Rainbow Trout, Brown Trout, and Cutthroat Trout on a reservoir. Also recorded: Walleye. It is stocked about 1.7 times a year since 2015, most often in April and October. Species guides list dawn and dusk for Rainbow Trout, dawn, day, and dusk for Brown Trout, and dawn, dusk, and night for Walleye.
- Last stocked
- April 2026
- Rainbow Trout
- Plants on record
- 20
- Since 2015
- Species stocked
- 3 (+1 also recorded)
- Average size
- 5.8 in
- Elevation
- 5,381 ft
Fish at Gray Reef Reservoir
Brown Trout Stocked · 12 plants · last October 2025 Best: dawn, day, dusk 
Rainbow Trout Stocked · 6 plants · last April 2026 Best: dawn, dusk 
Cutthroat Trout Stocked · 2 plants · last April 2026 Last stocked April 2026 · avg 7 in · 2 plants
Cutthroat Trout species guide
Walleye Confirmed present Best: dawn, dusk, night Best: dawn, dusk, night
Walleye species guideGray Reef Reservoir, near Casper, Wyoming, offers fishing with available species including brown trout, cutthroat trout, rainbow trout, and walleye. Rainbow and cutthroat are stocked in the river below Gray Reef Dam. Fish are not stocked in the reservoir. Anglers can use a barrier-free fishing pier at Gray Reef Dam or launch canoes from the primitive campground below the dam. A boat ramp is also located one-half mile downstream. (recreation.gov, accessed September 22, 2026)
Drafted by AI from the cited sources and checked before publishing.
How Gray Reef Reservoir is stocked
No plants recorded in 2018.
Fish stocked in 2015
31,527
Fish stocked in 2016
5,052
Fish stocked in 2017
13,507
Fish stocked in 2019
2,701
Fish stocked in 2020
27,076
Fish stocked in 2021
5,000
Fish stocked in 2022
14,128
Fish stocked in 2023
5,007
Fish stocked in 2024
27,419
Fish stocked in 2025
5,505
Fish stocked in 2026
16,929
Stocking history
| Date | Species | Quantity | Avg. length | Source |
|---|---|---|---|---|
| April 2026 | Rainbow Trout | 11,913 | 3.5 in | report |
| April 2026 | Cutthroat Trout | 5,016 | 4.9 in | report |
| October 2025 | Brown Trout | 5,505 | 7.1 in | report |
| December 2024 | Rainbow Trout | 21,844 | 4.7 in | report |
| October 2024 | Brown Trout | 524 | 6.1 in | report |
| September 2024 | Brown Trout | 5,051 | 5.9 in | report |
| October 2023 | Brown Trout | 5,007 | 6.5 in | report |
| April 2022 | Cutthroat Trout | 2,002 | 9.1 in | report |
| April 2022 | Brown Trout | 12,126 | 3 in | report |
| September 2021 | Brown Trout | 5,000 | 8.3 in | report |
| May 2020 | Brown Trout | 5,007 | 6.9 in | report |
| April 2020 | Rainbow Trout | 22,069 | 4.2 in | report |
| July 2019 | Brown Trout | 800 | 7.2 in | report |
| May 2019 | Brown Trout | 1,901 | 6.3 in | report |
| October 2017 | Brown Trout | 5,005 | 9.6 in | report |
| April 2017 | Rainbow Trout | 8,502 | 3.6 in | report |
| September 2016 | Brown Trout | 5,052 | 6.4 in | report |
| October 2015 | Rainbow Trout | 10,010 | 3.2 in | report |
| October 2015 | Brown Trout | 4,500 | 5.7 in | report |
| April 2015 | Rainbow Trout | 17,017 | 3.9 in | report |
Access and facts
- Water type
- reservoir
- Nearest town
- Casper, WY
- Facilities
- restrooms, camping
Below Gray Reef Dam on the North Platte River, about 27-30 miles southwest of Casper. A barrier-free fishing pier, restroom, and primitive campground sit at the dam; a boat ramp and parking lot are a half mile downstream. No entrance fee.
Drafted by AI from the cited sources and checked before publishing.
Advisories, closures, regulations and water conditions change. Check the Wyoming Game and Fish Department before you go.
About Gray Reef Reservoir
The water surface elevation of Gray Reef Reservoir fluctuates widely on a daily basis, often going from nearly full to nearly empty. (recreation.gov, accessed September 22, 2026)
Drafted by AI from the cited sources and checked before publishing.
Nearest lakes
Common questions
What fish are at Gray Reef Reservoir?
Fishing Gray Reef Reservoir usually means Brown Trout: Brown Trout accounts for 12 of 20 plants on record, ahead of Rainbow Trout and one more. Brown Trout was last stocked October 2025, averaging 6.6 in. Rainbow Trout was last stocked April 2026, averaging 3.9 in. Cutthroat Trout was last stocked April 2026, averaging 7 in. Walleye is recorded here outside the stocking reports.
When is Gray Reef Reservoir stocked?
Last stocked April 2026. It is stocked about 1.7 times a year since 2015, most often in April and October. No plants recorded in 2018.
How big are the fish stocked at Gray Reef Reservoir?
Stocked fish average 5.8 in. Brown Trout average 6.6 in. Rainbow Trout average 3.9 in. Cutthroat Trout average 7 in.
How do you get on Gray Reef Reservoir?
The nearest town is Casper, WY. Facilities include restrooms and camping. Below Gray Reef Dam on the North Platte River, about 27-30 miles southwest of Casper. A barrier-free fishing pier, restroom, and primitive campground sit at the dam; a boat ramp and parking lot are a half mile downstream. No entrance fee.
Which lakes near Gray Reef Reservoir were stocked more recently?
Alcova Reservoir (1.5 mi) and Pathfinder Reservoir (10.3 mi) were stocked more recently. Alcova Reservoir is also stocked with Cutthroat Trout, Brown Trout, and Rainbow Trout and Pathfinder Reservoir is also stocked with Rainbow Trout and Cutthroat Trout.