Rock Island Lake Fish Stocking
Montana · 1933–2023 on record
According to Montana fish & wildlife agency, Rock Island Lake was last stocked August 1, 2023 with Cutthroat Trout. Rock Island Lake has 35 stocking records on file, spanning 1933–2023, with about 408,238 fish stocked over that period.
When Rock Island Lake is stocked
Rock Island Lake is typically stocked in summer, most often in August — 20 stocking events in that peak month.
Nearby stocked waters
Other stocked waters near Rock Island Lake, freshest activity first.
Rock Tree Lake
5 mi2 species · 10 records
Last stocked September 2024
Wiedy Lake
4 mi2 species · 9 records
Last stocked July 2024
Nymph Lake
4 mi2 species · 3 records
Last stocked September 2022
Marsh Lake
4 mi2 species · 8 records
Last stocked July 2021
Lake Of The Clouds
4 mi1 species · 9 records
Last stocked July 2020
Mosquito Lake
4 mi2 species · 5 records
Last stocked July 2020
Stocking history
Most recent stockings first. Dates shown at the precision the agency reported.
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| August 1, 2023 | Cutthroat Trout | 13,720 | 2.54" | Montana fish & wildlife agency |
| July 20, 2020 | Cutthroat Trout | 13,700 | 2.83" | Montana fish & wildlife agency |
| July 17, 2017 | Cutthroat Trout | 10,000 | 2.2" | Montana fish & wildlife agency |
| July 14, 2014 | Cutthroat Trout | 13,700 | 2.5" | Montana fish & wildlife agency |
| August 2, 2011 | Cutthroat Trout | 13,700 | 2.2" | Montana fish & wildlife agency |
| July 22, 2008 | Cutthroat Trout | 13,700 | 2.35" | Montana fish & wildlife agency |
| August 2, 2005 | Cutthroat Trout | 13,700 | 2.3" | Montana fish & wildlife agency |
| August 13, 2002 | Cutthroat Trout | 13,700 | 2.5" | Montana fish & wildlife agency |
Show 27 more stocking records →
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| August 2, 1999 | Cutthroat Trout | 13,700 | 2.1" | Montana fish & wildlife agency |
| August 12, 1996 | Cutthroat Trout | 13,700 | 2.3" | Montana fish & wildlife agency |
| August 9, 1993 | Cutthroat Trout | 13,700 | 2.2" | Montana fish & wildlife agency |
| August 13, 1990 | Cutthroat Trout | 13,663 | 1.8" | Montana fish & wildlife agency |
| August 3, 1988 | Cutthroat Trout | 1,263 | 2.1" | Montana fish & wildlife agency |
| August 13, 1987 | Cutthroat Trout | 13,723 | 1.8" | Montana fish & wildlife agency |
| August 18, 1984 | Cutthroat Trout | 13,700 | 2" | Montana fish & wildlife agency |
| August 5, 1981 | Cutthroat Trout | 5,995 | 2" | Montana fish & wildlife agency |
| August 7, 1980 | Cutthroat Trout | 26,119 | 2" | Montana fish & wildlife agency |
| July 23, 1977 | Cutthroat Trout | 13,700 | 2" | Montana fish & wildlife agency |
| August 27, 1974 | Cutthroat Trout | 5,040 | 2" | Montana fish & wildlife agency |
| August 9, 1972 | Cutthroat Trout | 10,560 | 2" | Montana fish & wildlife agency |
| August 27, 1970 | Cutthroat Trout | 15,000 | 3" | Montana fish & wildlife agency |
| July 24, 1968 | Cutthroat Trout | 21,115 | 3" | Montana fish & wildlife agency |
| August 4, 1967 | Cutthroat Trout | 5,000 | 3" | Montana fish & wildlife agency |
| July 29, 1967 | Cutthroat Trout | 6,000 | 2" | Montana fish & wildlife agency |
| September 21, 1966 | Cutthroat Trout | 9,000 | 4" | Montana fish & wildlife agency |
| September 21, 1966 | Cutthroat Trout | 540 | 9" | Montana fish & wildlife agency |
| August 23, 1966 | Cutthroat Trout | 13,100 | 3" | Montana fish & wildlife agency |
| October 11, 1965 | Cutthroat Trout | 18,000 | 3" | Montana fish & wildlife agency |
| October 2, 1948 | Cutthroat Trout | 12,600 | 0 | Montana fish & wildlife agency |
| September 11, 1947 | Cutthroat Trout | 11,700 | 1" | Montana fish & wildlife agency |
| September 3, 1942 | Cutthroat Trout | 15,000 | 2" | Montana fish & wildlife agency |
| August 16, 1939 | Brook Trout | 4,000 | 3" | Montana fish & wildlife agency |
| July 25, 1939 | Brook Trout | 3,000 | 3" | Montana fish & wildlife agency |
| August 16, 1938 | Brook Trout | 15,600 | 3" | Montana fish & wildlife agency |
| September 7, 1933 | Brook Trout | 7,800 | 2" | Montana fish & wildlife agency |
Frequently asked
When was Rock Island Lake last stocked?
According to Montana fish & wildlife agency, Rock Island Lake was last stocked August 1, 2023 with Cutthroat Trout.
What fish species are stocked in Rock Island Lake?
Rock Island Lake is stocked with Cutthroat Trout and Brook Trout.
What time of year is Rock Island Lake stocked?
Rock Island Lake is typically stocked in summer, most often in August.
How often is Rock Island Lake stocked?
Rock Island Lake is stocked intermittently — 35 recorded stockings between 1933 and 2023.
How many fish have been stocked in Rock Island Lake?
About 408,238 fish have been stocked in Rock Island Lake across 35 recorded events since 1933, per Montana fish & wildlife agency.
What size are the fish stocked in Rock Island Lake?
Fish stocked in Rock Island Lake average about 2.6 inches, based on the sizes the agency reported.