Walleye Stocked · 15 plants · last July 6, 2026 Best: dawn, dusk, night Petrolia Reservoir fishing
Petrolia Reservoir fishing is stocked with Rainbow Trout, Walleye, and Yellow Perch on a reservoir. Also recorded: Common Carp, Shorthead Redhorse, Bluegill, White Sucker, and Fathead Minnow. It is stocked about 1.3 times a year since 2011, most often in June and July. Species guides list dawn and dusk for Rainbow Trout and Common Carp, dawn, dusk, and night for Walleye, and dawn, day, and dusk for Yellow Perch and Bluegill.
- Last stocked
- July 6, 2026
- · Walleye
- Plants on record
- 20
- Since 2011
- Species stocked
- 3 (+5 also recorded)
- Average size
- 2.9 in
- Elevation
- 2,886.7 ft
Fish at Petrolia Reservoir
Around the dates Petrolia Reservoir is stocked, Open-Meteo's 2016-2025 archive puts mean air temperature at 66.5°F in June, 75.4°F in July. That is air temperature at these coordinates, not water temperature. Open-Meteo
Walleye Stocked · 15 plants · last July 6, 2026 Best: dawn, dusk, night 
Rainbow Trout Stocked · 4 plants · last June 10, 2022 Best: dawn, dusk 
Yellow Perch Stocked · 1 plant · last June 30, 2022 Best: dawn, day, dusk 
Common Carp Confirmed present Best: dawn, dusk Best: dawn, dusk
Common Carp species guide Shorthead Redhorse Confirmed present
Bluegill Confirmed present Best: dawn, day, dusk Best: dawn, day, dusk
Bluegill species guide White Sucker Confirmed present
Fathead Minnow Confirmed present How Petrolia Reservoir is stocked
Fish stocked in 2011
1,912
Fish stocked in 2012
1,605
Fish stocked in 2013
20,079
Fish stocked in 2014
20,224
Fish stocked in 2015
20,909
Fish stocked in 2016
21,743
Fish stocked in 2017
20,207
Fish stocked in 2018
7,605
Fish stocked in 2019
21,593
Fish stocked in 2020
20,252
Fish stocked in 2021
22,672
Fish stocked in 2022
54,008
Fish stocked in 2023
20,572
Fish stocked in 2024
22,262
Fish stocked in 2025
18,798
Fish stocked in 2026
20,000
Stocking history
| Date | Species | Quantity | Avg. length | Source |
|---|---|---|---|---|
| July 6, 2026 | Walleye | 20,000 | 1.6 in | report |
| June 24, 2025 | Walleye | 9,399 | 1.39 in | report |
| June 24, 2025 | Walleye | 9,399 | 1.39 in | report |
| June 26, 2024 | Walleye | 22,262 | 1.49 in | report |
| July 13, 2023 | Walleye | 20,572 | 2.35 in | report |
| July 5, 2022 | Walleye | 20,824 | 1.48 in | report |
| June 30, 2022 | Yellow Perch | 32,190 | 0.8 in | report |
| June 10, 2022 | Rainbow Trout | 994 | 5.84 in | report |
| July 6, 2021 | Walleye | 20,048 | 1.79 in | report |
| June 17, 2021 | Rainbow Trout | 2,624 | 8.6 in | report |
| June 18, 2020 | Walleye | 20,252 | 1.78 in | report |
| June 19, 2019 | Walleye | 21,593 | 1.36 in | report |
| July 3, 2018 | Walleye | 7,605 | 2.26 in | report |
| June 28, 2017 | Walleye | 20,207 | 1.88 in | report |
| June 28, 2016 | Walleye | 21,743 | 1.72 in | report |
| June 23, 2015 | Walleye | 20,909 | 1.55 in | report |
| June 24, 2014 | Walleye | 20,224 | 1.25 in | report |
| June 19, 2013 | Walleye | 20,079 | 1.5 in | report |
| July 17, 2012 | Rainbow Trout | 1,605 | 8.73 in | report |
| July 11, 2011 | Rainbow Trout | 1,912 | 8.76 in | report |
Access and facts
- Water type
- reservoir
- Nearest town
- Winnett
Irrigation reservoir on Flatwillow Creek, on private land FWP lists as open with no permission needed; water levels swing widely. From Winnett take Hwy 200 east 5.7 mi, Bench Rd south 5.2 mi, then Petrolia Bench Rd west about 1.5 mi.
Drafted by AI from the cited sources and checked before publishing.
Advisories, closures, regulations and water conditions change. Check the Montana Fish, Wildlife & Parks before you go.
Nearest lakes
Common questions
What fish are at Petrolia Reservoir?
Fishing Petrolia Reservoir usually means Walleye: Walleye accounts for 15 of 20 plants on record, ahead of Rainbow Trout and one more. Walleye was last stocked July 6, 2026, averaging 1.7 in. Rainbow Trout was last stocked June 10, 2022, averaging 8 in. Yellow Perch was last stocked June 30, 2022, averaging 0.8 in. Common Carp, Shorthead Redhorse, Bluegill, and White Sucker, plus 1 more are recorded here outside the stocking reports.
When is Petrolia Reservoir stocked?
Last stocked July 6, 2026. It is stocked about 1.3 times a year since 2011, most often in June and July.
How big are the fish stocked at Petrolia Reservoir?
Stocked fish average 2.9 in. Walleye average 1.7 in. Rainbow Trout average 8 in. Yellow Perch average 0.8 in.
How do you get on Petrolia Reservoir?
The nearest town is Winnett. Irrigation reservoir on Flatwillow Creek, on private land FWP lists as open with no permission needed; water levels swing widely. From Winnett take Hwy 200 east 5.7 mi, Bench Rd south 5.2 mi, then Petrolia Bench Rd west about 1.5 mi.