Williamson Reservoir Fish Stocking
Montana · 1950–2008 on record
According to Montana fish & wildlife agency, Williamson Reservoir was last stocked May 1, 2008 with Rainbow Trout. Williamson Reservoir has 25 stocking records on file, spanning 1950–2008, with about 79,713 fish stocked over that period.
When Williamson Reservoir is stocked
Williamson Reservoir is typically stocked in spring and summer, most often in May — 10 stocking events in that peak month.
Nearby stocked waters
Other stocked waters near Williamson Reservoir, freshest activity first.
Normandy Coulee Pond
13 mi2 species · 61 records
Last stocked June 2026
Bearpaw Lake
14 mi4 species · 214 records
Last stocked September 2025
Clawitter Reservoir
6 mi2 species · 11 records
Last stocked July 2018
Boneau Reservoir
6 mi4 species · 111 records
Last stocked June 2011
Agency Pond
7 mi1 species · 2 records
Last stocked May 2008
Twelvemile Coulee
13 mi1 species · 2 records
Last stocked September 2005
By species
Stocking history
Most recent stockings first. Dates shown at the precision the agency reported.
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| May 1, 2008 | Rainbow Trout | 2,520 | 5.6" | Montana fish & wildlife agency |
| June 14, 2007 | Rainbow Trout | 2,034 | 6.2" | Montana fish & wildlife agency |
| May 18, 2006 | Rainbow Trout | 2,000 | 5.65" | Montana fish & wildlife agency |
| June 8, 2005 | Rainbow Trout | 1,000 | 5.7" | Montana fish & wildlife agency |
| August 10, 2004 | Largemouth Bass | 3,500 | 2" | Montana fish & wildlife agency |
| July 2, 2002 | Rainbow Trout | 1,001 | 6.8" | Montana fish & wildlife agency |
| June 20, 2001 | Rainbow Trout | 1,196 | 7.2" | Montana fish & wildlife agency |
| June 19, 1997 | Rainbow Trout | 1,000 | 6.9" | Montana fish & wildlife agency |
Show 17 more stocking records →
| Date | Species | Number | Size | Source |
|---|---|---|---|---|
| June 26, 1996 | Rainbow Trout | 500 | 6" | Montana fish & wildlife agency |
| July 12, 1995 | Rainbow Trout | 500 | 7" | Montana fish & wildlife agency |
| May 26, 1994 | Rainbow Trout | 500 | 7" | Montana fish & wildlife agency |
| May 4, 1993 | Rainbow Trout | 500 | 7" | Montana fish & wildlife agency |
| May 26, 1992 | Rainbow Trout | 500 | 6.6" | Montana fish & wildlife agency |
| June 11, 1991 | Rainbow Trout | 500 | 6.4" | Montana fish & wildlife agency |
| April 24, 1990 | Rainbow Trout | 500 | 7" | Montana fish & wildlife agency |
| May 25, 1982 | Rainbow Trout | 5,000 | 2" | Montana fish & wildlife agency |
| May 19, 1981 | Rainbow Trout | 5,000 | 5" | Montana fish & wildlife agency |
| May 13, 1980 | Rainbow Trout | 5,000 | 4" | Montana fish & wildlife agency |
| July 6, 1978 | Rainbow Trout | 5,000 | 3" | Montana fish & wildlife agency |
| May 1, 1974 | Rainbow Trout | 2,062 | 4" | Montana fish & wildlife agency |
| October 5, 1971 | Bluegill | 2,500 | 1" | Montana fish & wildlife agency |
| July 28, 1971 | Largemouth Bass | 5,000 | 2" | Montana fish & wildlife agency |
| October 8, 1957 | Bluegill | 21,000 | 1" | Montana fish & wildlife agency |
| October 8, 1957 | Largemouth Bass | 4,200 | 3" | Montana fish & wildlife agency |
| May 25, 1950 | Brook Trout | 7,200 | 3" | Montana fish & wildlife agency |
Frequently asked
When was Williamson Reservoir last stocked?
According to Montana fish & wildlife agency, Williamson Reservoir was last stocked May 1, 2008 with Rainbow Trout.
What fish species are stocked in Williamson Reservoir?
Williamson Reservoir is stocked with Rainbow Trout, Largemouth Bass, Bluegill, and Brook Trout.
What time of year is Williamson Reservoir stocked?
Williamson Reservoir is typically stocked in spring and summer, most often in May.
How often is Williamson Reservoir stocked?
Williamson Reservoir is stocked intermittently — 25 recorded stockings between 1950 and 2008.
How many fish have been stocked in Williamson Reservoir?
About 79,713 fish have been stocked in Williamson Reservoir across 25 recorded events since 1950, per Montana fish & wildlife agency.
What size are the fish stocked in Williamson Reservoir?
Fish stocked in Williamson Reservoir average about 4.8 inches, based on the sizes the agency reported.