Rock Lake
Autumn counts here. Of the 83,289 catchable trout released at Rock Lake in 2025, 68,883 (83%) went in during autumn and 14,406 in spring.
WDFW data through Oct 30, 2026. Page updated .
Rock Lake in numbers
- catchable trout in 2025
- 83,289
- so far in 2026, through Oct 30
- 42,770
- 2025 against the 2015–2025 average of 76,285 a year
- +9%
2026 is running behind 2025: 42,770 fish through Oct 30, against 75,789 by the same date a year earlier. The latest batch, 11,520 rainbow trout, went in on Oct 30, 2026, 6 days before this page was built.
WDFW lists Rock Lake as 2,189.6 acres in Whitman County, at 1,728 ft. Per acre, Rock Lake got about 38 catchable trout in 2025, which puts it 30th of the 37 waters on this site with a WDFW acreage.
Every release since January 2025
10 species-date records, newest first. Fish per lb is the figure WDFW reports for each batch.
Fish released each year
2025 is yellow. 2026 is outlined because the year is not over: the data runs to Oct 30, 2026. The busiest full year was 2024, with 9 release dates and 113,144 fish; the 2015–2025 average is 5.9 release dates a year.
How big are these fish?
- Under 4 oz
- 87,229 fish, 69%
- 4 to 8 oz
- 38,830 fish, 31%
Weight is 1 ÷ fish per lb, as WDFW reports it for each batch. It is a batch average, not a guarantee for any one fish. Counts cover every release since January 2025.
Notes from the records
The biggest single batch since January 2025 was 21,560 rainbow trout on Oct 27, 2025. The heaviest fish were 7,650 rainbow trout on Oct 24, 2025, at 3 per lb, about 5 oz each.
Species in these records: rainbow trout, brown trout.
Timing shifts from year to year. Treat this as a pattern, not a promise.
Closest waters on this site
Straight-line distance between the map points WDFW gives for each water, not driving distance.