Rainbow Dam Reservoir trout stocking
Cascade County, Montana · lake · 3,244 ft elevation
Rainbow Dam Reservoir was last stocked 7 weeks ago (Sep 18, 2026). We have 16 stockings on record since Apr 28, 2025, 9 in the last 12 months (13,589 fish). Most stockings come in June to August. Species stocked: rainbow trout.
- The most stocked water in Cascade County (16 stocking days on record).
- Stocked more often than 99% of Montana waters on our record.
Weather at Rainbow Dam Reservoir
- Tonight39°FMostly Cloudywind 9 to 17 mph
- Monday58°FMostly Cloudy3% rain · wind 2 to 8 mph
- Monday Night42°FMostly Cloudy6% rain · wind 3 to 21 mph
- Tuesday59°FMostly Sunny1% rain · wind 18 to 30 mph
- Tuesday Night43°FPartly Cloudywind 16 to 20 mph
- Veterans Day67°FMostly Sunnywind 12 to 22 mph
Forecast from the National Weather Service for this location, refreshed hourly.
When is Rainbow Dam Reservoir stocked?
Most stockings come in June to August. Stocked 9 times in 2026, about every 18 days.
By month, all years
Year by year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 2 | 2 | 3 | 1 | |||||||
| 2025 | 1 | 2 | 2 | 1 | 1 |
What is stocked
| Species | Stockings | Fish | Fish per stocking | Typical size |
|---|---|---|---|---|
| Rainbow trout | 16 | 30,547 | 1,909 | 7.9 in |
Stocking history
20269 stockings · 13,589 fish
| Date | Species | Fish | Size | Since previous | Hatchery |
|---|---|---|---|---|---|
Sep 18Latest Friday · 7 weeks ago | Rainbow trout | 3,600 | 8.0 in | 23 days | Giant Springs Trout Hatchery |
Aug 26 Wednesday | Rainbow trout | 883 | 11.1 in | 1 day | Giant Springs Trout Hatchery |
Aug 25 Tuesday | Rainbow trout | 640 | 11.1 in | 12 days | Giant Springs Trout Hatchery |
Aug 13 Thursday | Rainbow trout | 1,466 | 7.8 in | 16 days | Giant Springs Trout Hatchery |
Jul 28 Tuesday | Rainbow trout | 1,000 | 6.9 in | 18 days | Giant Springs Trout Hatchery |
Jul 10 Friday | Rainbow trout | 1,200 | 9.7 in | 22 days | Giant Springs Trout Hatchery |
Jun 18 Thursday | Rainbow trout | 2,000 | 5.8 in | 17 days | Giant Springs Trout Hatchery |
Jun 1 Monday | Rainbow trout | 1,000 | 7.9 in | 39 days | Giant Springs Trout Hatchery |
Apr 23 Thursday | Rainbow trout | 1,800 | 7.1 in | 191 days | Giant Springs Trout Hatchery |
20257 stockings · 16,958 fish
| Date | Species | Fish | Size | Since previous | Hatchery |
|---|---|---|---|---|---|
Oct 14 Tuesday | Rainbow trout | 2,352 | 8.7 in | 6 weeks | Giant Springs Trout Hatchery |
Sep 2 Tuesday | Rainbow trout | 3,155 | 9.2 in | 34 days | Giant Springs Trout Hatchery |
Jul 30 Wednesday | Rainbow trout | 5,451 | 8.3 in | 20 days | Giant Springs Trout Hatchery |
Jul 10 Thursday | Rainbow trout | 500 | 6.7 in | 20 days | Giant Springs Trout Hatchery |
Jun 20 Friday | Rainbow trout | 2,000 | 8.3 in | 4 days | Giant Springs Trout Hatchery |
Jun 16 Monday | Rainbow trout | 1,500 | 6.1 in | 7 weeks | Giant Springs Trout Hatchery |
Apr 28 Monday | Rainbow trout | 2,000 | 6.9 in | Giant Springs Trout Hatchery |
From Montana fish and wildlife agency reports, collected nightly and kept after the agency takes them down. Agencies revise reports; check the agency's report before you go. Seasons and limits: Montana fishing regulations.
Where is Rainbow Dam Reservoir?
Cascade County, Montana. The marker is the agency's location for this water; streams are often stocked at several access points.
Stocked waters near Rainbow Dam Reservoir
- Giant Springs Fishing Pondlake · 1 mistocked Oct 1, 2026
- Wadsworth Lakelake · 8 mistocked Sep 9, 2026
- Briggs Pondlake · 21 mistocked May 28, 2026
- SSS Pondlake · 22 mistocked May 29, 2026
All stocked waters in Cascade CountyStocked this week in Montana
Questions about Rainbow Dam Reservoir
- When was Rainbow Dam Reservoir last stocked?
- The latest reported stocking was Sep 18, 2026 (rainbow trout, 3,600 fish), according to Montana agency reports.
- How often is Rainbow Dam Reservoir stocked?
- Stocked 9 times in 2026, about every 18 days. Across all years on record, most stockings come in June to August.
- Is Rainbow Dam Reservoir stocked often?
- The most stocked water in Cascade County (16 stocking days on record). Stocked more often than 99% of Montana waters on our record. We count each day the agency reported stocking it.
- What kind of trout are stocked in Rainbow Dam Reservoir?
- Rainbow trout (16 stockings, 30,547 fish).