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Stocked last season

Rock Island Lake Fish Stocking

Montana · 1933 to 2023 on record

According to FWP records, Rock Island Lake has 34 stocking records on file across 3 species. The most recent stocking season represented is 2023.

Rock Island Lake stocking
Rock Island Lake photo
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34
Stocking records
394,538
Fish reported stocked
3
Species
2023
Latest season

Stocking activity by season

30 seasons on record, most in the 1966 (3 records). Click a bar to jump to that season below.

1 records
2023 · 13,720 fish
1948
1965
1966
1967
1968
1970
1972
1974
1977
1980
1981
1984
1987
1988
1990
1993
1996
1999
2002
2005
2008
2011
2017
2020
2023

Stocking records per season (labelled by the season's end year). Montana's source reports by season, so records aren't broken out by month. Showing the most recent 25 of 30 seasons — the full history is listed below.

Most-stocked species

Yellowstone Cutthroat Trout 27 records
Brook Trout 4 records
Cutthroat Trout 3 records

Location

45.0157, -109.8103

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Stocking history

Values shown exactly as the agency reported them; species names are normalized for search.

SpeciesFish stockedSizePhase
Yellowstone Cutthroat Trout 13,720 2.54 in Yellowstone Basin-Big Timber

A stocking record does not guarantee fish remain present or may legally be harvested. Check current Montana fishing regulations →

Quick facts

Latest season 2023
Most stocked Yellowstone Cutthroat Trout
Species Yellowstone Cutthroat Trout, Brook Trout, Cutthroat Trout
Seasons on record 1933 – 2023
Fish reported 394,538
Coordinates 45.0157, -109.8103

Data source

Compiled from public records published by the Montana Fish, Wildlife & Parks. StockedSpots is independent and not affiliated with or endorsed by FWP.

Source: Montana Fish, Wildlife & Parks (FWP). Data last checked September 1, 2026.
View FWP source →

Nearby stocked waters

Frequently asked questions

FWP records show Rock Island Lake stocked with Yellowstone Cutthroat Trout, Brook Trout, Cutthroat Trout.

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Every stocking record on StockedSpots is pulled directly from official state wildlife agency sources — you can see exactly where each state's data comes from on our data sources page. If a record looks wrong, or you'd like a page reviewed or removed, let us know and we'll look into it.

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