Castle Rock Reservoir fishing

Fishing at Castle Rock Reservoir has Walleye, Smallmouth Bass, and Channel Catfish on the stocking report. It is stocked about 1.5 times a year since 2011, most often in June and August. Species guides list dawn, dusk, and night for Walleye, dawn and dusk for Smallmouth Bass, and dusk and night for Channel Catfish.

Last stocked

June 19, 2025

Plants on record

22

Since 2011

Species recorded

3

Average size

1.7 in

Elevation

3,259.3 ft

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How Castle Rock Reservoir is stocked

The first plant of the year usually falls in the third week of June. In 2025 it was June 19, 2025, about when it usually is.

Spotted Eagle Lake (50.9 mi) was stocked more recently. Spotted Eagle Lake is also stocked with Smallmouth Bass, Channel Catfish, and Walleye.

Fish at Castle Rock Reservoir

Fishing Castle Rock Reservoir is most likely to be for Walleye. Walleye accounts for 15 of 22 plants on record, ahead of Channel Catfish and one more.

Around the dates Castle Rock Reservoir is stocked, Open-Meteo's 2016-2025 archive puts mean air temperature at 67.5°F in June, 73.4°F in August, 75.9°F in July, 64°F in September. That is air temperature at these coordinates, not water temperature. Open-Meteo

Walleye 15 plants
Plants
15 of 22
Last stocked
June 19, 2025
Average length
1.6 in

Seasons and rigs are on the Walleye guide.

Channel Catfish 5 plants
Plants
5 of 22
Last stocked
September 30, 2021
Average length
1.9 in

Seasons and rigs are on the Channel Catfish guide.

Smallmouth Bass 2 plants
Plants
2 of 22
Last stocked
August 3, 2018
Average length
2.3 in

Seasons and rigs are on the Smallmouth Bass guide.

Fish stocked per year

  • 1,0002011
  • 1,0002012
  • 1,0002013
  • 5,0002014
  • 2,0002015
  • 1,0002016
  • 2,0002017
  • 5,0002018
  • 1,0002019
  • 3,0002020
  • 10,2272021
  • 1,0002022
  • 1,0002023
  • 1,0002024
  • 1,0002025

Stocking history

Showing 15 of 22 plants Showing 22 plants

Source: Montana Fish, Wildlife & Parks.
Date Species Quantity Avg. length Source
June 19, 2025 Walleye 1,000 1.29 in report
June 11, 2024 Walleye 1,000 1.39 in report
July 12, 2023 Walleye 1,000 2.01 in report
June 15, 2022 Walleye 1,000 1.13 in report
September 30, 2021 Channel Catfish 8,227 1.57 in report
August 20, 2021 Channel Catfish 1,000 1.69 in report
June 28, 2021 Walleye 1,000 1.76 in report
August 19, 2020 Channel Catfish 1,000 1.61 in report
June 10, 2020 Walleye 2,000 2.79 in report
June 19, 2019 Walleye 1,000 1.59 in report
August 3, 2018 Smallmouth Bass 4,000 2.19 in report
June 24, 2018 Walleye 1,000 1.7 in report
August 22, 2017 Channel Catfish 1,000 2 in report
June 14, 2017 Walleye 1,000 1.51 in report
June 14, 2016 Walleye 1,000 1.34 in report
July 22, 2015 Channel Catfish 1,000 2.5 in report
June 16, 2015 Walleye 1,000 2 in report
September 2, 2014 Smallmouth Bass 4,000 2.49 in report
June 24, 2014 Walleye 1,000 1.25 in report
June 11, 2013 Walleye 1,000 1.5 in report
June 11, 2012 Walleye 1,000 1.49 in report
June 21, 2011 Walleye 1,000 1.12 in report
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Species stocked here

Depth-by-season, top lures, and bait notes for each species stocked here are on its own species guide, linked above.

Nearest lakes