What species are stocked in Rock Island Lake?

On record: Yellowstone Cutthroat Trout, Cutthroat Trout, Brook Trout. Source: Montana Fish, Wildlife & Parks.

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Montana stocking report

Rock Island Lake

35 records Last reported: August 1, 2023

Last reported stocking

The latest reported stocking at Rock Island Lake was on August 1, 2023: 13,720 Yellowstone Cutthroat Trout (2.54 in avg).

Record last checked: 2026-07-24. This is not a stocking date.

Browse stocking history

Source: Montana Fish, Wildlife & Parks.

A schedule is a plan, not confirmation that fish were released. Stocking records do not guarantee fish are still available.

No current or upcoming schedule is in this archive. Check the official report before choosing a trip date.

County: Park
Species on record: Yellowstone Cutthroat Trout, Cutthroat Trout, Brook Trout
Records: 35 records
Official source: Montana Fish, Wildlife & Parks report

Location map

Rock Island Lake location context

Agency coordinates · access unverified

Rock Island LakeAgency coordinates Dailey LakeAgency coordinates Sacajawea Park LagoonAgency coordinates Corner LakeAgency coordinates Basin LakeAgency coordinates

Pins appear only when the record includes coordinates; they are not verified access points. Shaded counties show area context only. Waters without coordinates stay in the list without a pin; confirm access and directions with the official agency source.

Before you go

Plan a trip to Rock Island Lake

Check the latest report

Confirm dates and any changes in the official stocking report. Historical schedules are kept below even after their planned dates pass.

Check access and fishing rules

Use Montana's official fishing information to find current guidance. Confirm the exact water, public access, closures, and applicable fishing rules before leaving.

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The map gives location context. A shaded county is area context, not directions to a fishing spot or evidence of public access.

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Looking for a different Rock Island Lake? Also on record: Rock Island Lake (Elmore County, Idaho) · Rock Island Lake (Idaho County, Idaho)

Agency records

Stocking history

35 records from September 7, 1933 to August 1, 2023. Open a year to browse its records; scroll tables sideways for all columns. Scheduled means planned, even when the date has passed. Blank fields mean the source did not publish that detail.

2023 1 record

2023 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 1, 2023 reported	Yellowstone Cutthroat Trout	13,720	2.54 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

2020 1 record

2020 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
July 20, 2020 reported	Yellowstone Cutthroat Trout	13,700	2.83 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

2017 1 record

2017 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
July 17, 2017 reported	Yellowstone Cutthroat Trout	10,000	2.2 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

2014 1 record

2014 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
July 14, 2014 reported	Yellowstone Cutthroat Trout	13,700	2.5 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

2011 1 record

2011 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 2, 2011 reported	Yellowstone Cutthroat Trout	13,700	2.2 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

2008 1 record

2008 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
July 22, 2008 reported	Yellowstone Cutthroat Trout	13,700	2.35 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

2005 1 record

2005 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 2, 2005 reported	Yellowstone Cutthroat Trout	13,700	2.3000000000000003 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

2002 1 record

2002 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 13, 2002 reported	Yellowstone Cutthroat Trout	13,700	2.5 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1999 1 record

1999 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 2, 1999 reported	Yellowstone Cutthroat Trout	13,700	2.1 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1996 1 record

1996 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 12, 1996 reported	Yellowstone Cutthroat Trout	13,700	2.3000000000000003 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1993 1 record

1993 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 9, 1993 reported	Yellowstone Cutthroat Trout	13,700	2.2 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1990 1 record

1990 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 13, 1990 reported	Yellowstone Cutthroat Trout	13,663	1.8 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1988 1 record

1988 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 3, 1988 reported	Yellowstone Cutthroat Trout	1,263	2.1 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1987 1 record

1987 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 13, 1987 reported	Yellowstone Cutthroat Trout	13,723	1.8 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1984 1 record

1984 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 18, 1984 reported	Yellowstone Cutthroat Trout	13,700	2 in avg	Washoe Park Trout Hatchery	Montana Fish, Wildlife & Parks

1981 1 record

1981 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 5, 1981 reported	Yellowstone Cutthroat Trout	5,995	2 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1980 1 record

1980 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 7, 1980 reported	Yellowstone Cutthroat Trout	26,119	2 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1977 1 record

1977 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
July 23, 1977 reported	Yellowstone Cutthroat Trout	13,700	2 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1974 1 record

1974 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 27, 1974 reported	Yellowstone Cutthroat Trout	5,040	2 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1972 1 record

1972 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 9, 1972 reported	Yellowstone Cutthroat Trout	10,560	2 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1970 1 record

1970 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 27, 1970 reported	Yellowstone Cutthroat Trout	15,000	3 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1968 1 record

1968 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
July 24, 1968 reported	Yellowstone Cutthroat Trout	21,115	3 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1967 2 records

1967 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 4, 1967 reported	Yellowstone Cutthroat Trout	5,000	3 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks
July 29, 1967 reported	Yellowstone Cutthroat Trout	6,000	2 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1966 3 records

1966 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
September 21, 1966 reported	Yellowstone Cutthroat Trout	540	9 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks
September 21, 1966 reported	Yellowstone Cutthroat Trout	9,000	4 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks
August 23, 1966 reported	Yellowstone Cutthroat Trout	13,100	3 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1965 1 record

1965 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
October 11, 1965 reported	Cutthroat Trout	18,000	3 in avg	Yellowstone River Trout Hatchery	Montana Fish, Wildlife & Parks

1948 1 record

1948 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
October 2, 1948 reported	Cutthroat Trout	12,600		Emigrant	Montana Fish, Wildlife & Parks

1947 1 record

1947 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
September 11, 1947 reported	Cutthroat Trout	11,700	1 in avg	Emigrant	Montana Fish, Wildlife & Parks

1942 1 record

1942 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
September 3, 1942 reported	Yellowstone Cutthroat Trout	15,000	2 in avg	Emigrant	Montana Fish, Wildlife & Parks

1939 2 records

1939 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 16, 1939 reported	Brook Trout	4,000	3 in avg	Unknown	Montana Fish, Wildlife & Parks
July 25, 1939 reported	Brook Trout	3,000	3 in avg	Unknown	Montana Fish, Wildlife & Parks

1938 1 record

1938 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
August 16, 1938 reported	Brook Trout	15,600	3 in avg	Unknown	Montana Fish, Wildlife & Parks

1933 1 record

1933 stocking records and official sources
Date / status	Species	Fish	Size	Hatchery	Source
September 7, 1933 reported	Brook Trout	7,800	2 in avg	Emigrant	Montana Fish, Wildlife & Parks

Records retain the dates, quantities, and status supplied by the linked agencies. An event missing here does not mean the water was not stocked - some plants go unreported or are published elsewhere.

Grouped by county and sorted by latest record, not by driving distance. Confirm access for each water.

Data source: Montana Fish, Wildlife & Parks. A record for this water was last checked on 2026-07-24. This check date is not a stocking date.

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