Last stocked
September 9, 2026
Plants on record
104
Since 2012
Species recorded
4
Average size
14 in
Surface acres
416
Elevation
5,902 ft
Access and facts
- Water type
- reservoir
- Facilities
- camping
A 171-foot earthen dam impounds Castle Creek to form this Black Hills National Forest reservoir, which also supplies Rapid City's water supply. US Forest Service campgrounds and recreation areas ring the shoreline, popular for ice fishing in winter.
Sources: water_type , shore_notes , facilities , fishing_notes
How Deerfield Reservoir is stocked
The first plant of the year usually falls in the second week of May. In 2026 it was April 20, 2026, earlier than usual.
About 750 reported fish per acre, the fewest of 3 lakes in Pennington County with both a fish count and a surface area.
Sylvan Lake (16.8 mi) was stocked more recently. Sylvan Lake is also stocked with Rainbow Trout.
Fish at Deerfield Reservoir
Fishing Deerfield Reservoir is most likely to be for Rainbow Trout. Rainbow Trout accounts for 88 of 104 plants on record, ahead of Lake Trout and 2 more.
Rainbow Trout 88 plants
- Plants
- 88 of 104
- Last stocked
- September 9, 2026
- Average length
- 13 in
Lake Trout 10 plants
- Plants
- 10 of 104
- Last stocked
- November 14, 2023
- Average length
- 25.1 in
Walleye 5 plants
- Plants
- 5 of 104
- Last stocked
- July 15, 2026
Splake 1 plant
- Plants
- 1 of 104
- Last stocked
- October 18, 2012
Fishing Deerfield Reservoir
Deerfield Reservoir offers recreation such as ice fishing. The reservoir is created by Deerfield Dam within the Black Hills National Forest. The earthen dam was originally built by the United States Bureau of Reclamation. Public recreational opportunities are offered to the lake area.
Sources: en.wikipedia.org
Fish stocked per year
- 18,3532012
- 12,0002013
- 12,0002014
- 12,7352015
- 9,9162016
- 9,6872017
- 9,0302018
- 7,1902019
- 9,7422020
- 9,1722021
- 8,7822022
- 13,9542023
- 27,9232024
- 88,3862025
- 63,0292026
Stocking history
Showing 15 of 104 plants Showing 104 plants
| Date | Species | Quantity | Avg. length | Source |
|---|---|---|---|---|
| September 9, 2026 | Rainbow Trout | 396 | 15.5 in | report |
| September 9, 2026 | Rainbow Trout | 880 | 14.5 in | report |
| August 28, 2026 | Rainbow Trout | 1,408 | 14.5 in | report |
| August 27, 2026 | Rainbow Trout | 1,408 | 14.5 in | report |
| July 15, 2026 | Walleye | 24,737 | – | report |
| June 11, 2026 | Walleye | 30,700 | – | report |
| April 21, 2026 | Rainbow Trout | 1,167 | 13 in | report |
| April 20, 2026 | Rainbow Trout | 473 | 13 in | report |
| April 20, 2026 | Rainbow Trout | 1,860 | 12.8 in | report |
| September 4, 2025 | Rainbow Trout | 464 | 15.5 in | report |
| September 3, 2025 | Rainbow Trout | 1,904 | 15.5 in | report |
| September 2, 2025 | Rainbow Trout | 1,088 | 15.5 in | report |
| June 2, 2025 | Walleye | 80,930 | – | report |
| May 7, 2025 | Rainbow Trout | 1,677 | 13 in | report |
| May 5, 2025 | Rainbow Trout | 470 | 13 in | report |
| May 5, 2025 | Rainbow Trout | 1,353 | 14.5 in | report |
| April 25, 2025 | Walleye | 500 | – | report |
| October 11, 2024 | Walleye | 6,318 | – | report |
| August 13, 2024 | Rainbow Trout | 3,112 | 12.6 in | report |
| August 12, 2024 | Rainbow Trout | 3,112 | 12.6 in | report |
| July 29, 2024 | Rainbow Trout | 2,678 | 11.2 in | report |
| July 29, 2024 | Rainbow Trout | 2,737 | 11.4 in | report |
| July 23, 2024 | Rainbow Trout | 2,184 | 11.2 in | report |
| July 23, 2024 | Rainbow Trout | 3,472 | 11 in | report |
| May 6, 2024 | Rainbow Trout | 1,494 | 15.2 in | report |
| May 1, 2024 | Rainbow Trout | 2,816 | 15.5 in | report |
| November 16, 2023 | Rainbow Trout | 1,267 | 13 in | report |
| November 14, 2023 | Lake Trout | 286 | – | report |
| November 6, 2023 | Lake Trout | 250 | – | report |
| November 1, 2023 | Rainbow Trout | 3,150 | 13 in | report |
| August 18, 2023 | Rainbow Trout | 2,415 | 14.5 in | report |
| August 17, 2023 | Rainbow Trout | 2,086 | 14.5 in | report |
| June 2, 2023 | Rainbow Trout | 951 | 15.2 in | report |
| May 10, 2023 | Rainbow Trout | 1,764 | 12.8 in | report |
| May 5, 2023 | Rainbow Trout | 1,785 | 12.6 in | report |
| September 19, 2022 | Rainbow Trout | 1,218 | 12.4 in | report |
| August 31, 2022 | Rainbow Trout | 645 | 17 in | report |
| August 31, 2022 | Rainbow Trout | 676 | 15.2 in | report |
| August 30, 2022 | Rainbow Trout | 489 | 15.2 in | report |
| August 29, 2022 | Rainbow Trout | 1,732 | 15.2 in | report |
| June 3, 2022 | Rainbow Trout | 530 | 15.2 in | report |
| June 2, 2022 | Rainbow Trout | 530 | 15.2 in | report |
| June 1, 2022 | Rainbow Trout | 530 | 15.2 in | report |
| May 18, 2022 | Rainbow Trout | 649 | 14 in | report |
| May 17, 2022 | Rainbow Trout | 649 | 14 in | report |
| May 13, 2022 | Rainbow Trout | 567 | 14.5 in | report |
| May 12, 2022 | Rainbow Trout | 567 | 14.5 in | report |
| November 4, 2021 | Rainbow Trout | 1,500 | 12.8 in | report |
| October 28, 2021 | Rainbow Trout | 3,078 | 12.6 in | report |
| May 27, 2021 | Rainbow Trout | 900 | 14 in | report |
| May 11, 2021 | Rainbow Trout | 1,847 | 15.2 in | report |
| May 10, 2021 | Rainbow Trout | 1,847 | 15.2 in | report |
| November 5, 2020 | Rainbow Trout | 1,760 | 13 in | report |
| November 4, 2020 | Rainbow Trout | 3,066 | 12.6 in | report |
| May 8, 2020 | Rainbow Trout | 2,332 | 15 in | report |
| May 7, 2020 | Rainbow Trout | 1,666 | 15 in | report |
| May 6, 2020 | Rainbow Trout | 918 | 11 in | report |
| August 21, 2019 | Rainbow Trout | 1,345 | 15 in | report |
| August 20, 2019 | Rainbow Trout | 1,345 | 15 in | report |
| June 5, 2019 | Rainbow Trout | 1,636 | 11 in | report |
| May 31, 2019 | Rainbow Trout | 1,432 | 15 in | report |
| May 30, 2019 | Rainbow Trout | 1,432 | 15 in | report |
| August 30, 2018 | Rainbow Trout | 1,152 | 15.2 in | report |
| August 29, 2018 | Rainbow Trout | 1,642 | 15.2 in | report |
| August 27, 2018 | Rainbow Trout | 1,642 | 15.2 in | report |
| May 16, 2018 | Rainbow Trout | 1,071 | 12.2 in | report |
| May 15, 2018 | Rainbow Trout | 2,520 | 12.2 in | report |
| May 15, 2018 | Rainbow Trout | 1,003 | 12.4 in | report |
| October 30, 2017 | Rainbow Trout | 1,102 | 11 in | report |
| August 29, 2017 | Rainbow Trout | 3,694 | 11 in | report |
| June 6, 2017 | Rainbow Trout | 1,129 | 11 in | report |
| June 5, 2017 | Rainbow Trout | 3,762 | 11 in | report |
| September 22, 2016 | Lake Trout | 400 | 30 in | report |
| August 25, 2016 | Rainbow Trout | 2,508 | 11 in | report |
| August 18, 2016 | Rainbow Trout | 2,508 | 11 in | report |
| May 10, 2016 | Rainbow Trout | 4,500 | 11 in | report |
| November 17, 2015 | Lake Trout | 166 | 23.5 in | report |
| November 17, 2015 | Lake Trout | 145 | 23.5 in | report |
| November 10, 2015 | Lake Trout | 66 | 23.5 in | report |
| November 10, 2015 | Lake Trout | 48 | 23.5 in | report |
| November 4, 2015 | Lake Trout | 40 | 23.5 in | report |
| November 4, 2015 | Lake Trout | 210 | 23.5 in | report |
| September 1, 2015 | Rainbow Trout | 3,000 | 11 in | report |
| July 7, 2015 | Rainbow Trout | 3,000 | 11 in | report |
| June 2, 2015 | Rainbow Trout | 3,000 | 11 in | report |
| April 29, 2015 | Lake Trout | 60 | 30 in | report |
| April 21, 2015 | Rainbow Trout | 3,000 | 11 in | report |
| September 4, 2014 | Rainbow Trout | 3,567 | 11 in | report |
| September 3, 2014 | Rainbow Trout | 2,433 | 11 in | report |
| June 3, 2014 | Rainbow Trout | 3,000 | 11 in | report |
| May 19, 2014 | Rainbow Trout | 3,000 | 11 in | report |
| September 24, 2013 | Rainbow Trout | 2,000 | 11 in | report |
| September 9, 2013 | Rainbow Trout | 2,000 | 11 in | report |
| August 12, 2013 | Rainbow Trout | 2,000 | 11 in | report |
| July 9, 2013 | Rainbow Trout | 2,000 | 11 in | report |
| June 3, 2013 | Rainbow Trout | 2,000 | 11 in | report |
| May 15, 2013 | Rainbow Trout | 2,000 | 11 in | report |
| October 18, 2012 | Splake | 5,853 | – | report |
| October 3, 2012 | Rainbow Trout | 2,000 | 11 in | report |
| September 14, 2012 | Rainbow Trout | 2,500 | 11 in | report |
| August 17, 2012 | Rainbow Trout | 2,000 | 11 in | report |
| July 11, 2012 | Rainbow Trout | 2,000 | 11 in | report |
| June 12, 2012 | Rainbow Trout | 2,000 | 11 in | report |
| May 1, 2012 | Rainbow Trout | 2,000 | 11 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.