Isabella Lake Fishing Regulations
Mason County, Washington · 2026 size limits, bag limits, and seasons
Isabella Lake is a lake in Mason County, Washington. It has its own fishing regulations for 4 species, including Channel Catfish, Largemouth Bass, Smallmouth Bass, and Walleye. These rules replace Washington's statewide limits on this water.
Map of Isabella Lake
Fish with special rules on Isabella Lake
Tap a fish for identification tips, size records, and the best bait.
Isabella Lake limits by species (2026)
| Species | Size limit | Daily bag | Season |
|---|---|---|---|
 Channel Catfish | – | 10 | Year-round |
 Largemouth Bass1 over 17” may be retained. | 12" max | 10 | Year-round |
 Smallmouth BassOnly 1 over 14” may be retained. | – | 15 | Year-round |
 WalleyeOnly 1 over 22” may be retained. | – | 16 | Year-round |
– means no limit is listed for this water. Rules not shown here follow Washington's statewide regulations.
Plan your Isabella Lake trip
Isabella Lake fishing: common questions
What fish have special regulations on Isabella Lake?
4 species have rules specific to Isabella Lake: Channel Catfish, Largemouth Bass, Smallmouth Bass, and Walleye.
What is the channel catfish limit on Isabella Lake?
No size limit is listed for Channel Catfish on Isabella Lake, and the daily bag limit is 10.
What is the largemouth bass limit on Isabella Lake?
Largemouth Bass have a maximum size of 12" on Isabella Lake, and the daily bag limit is 10.
What is the smallmouth bass limit on Isabella Lake?
No size limit is listed for Smallmouth Bass on Isabella Lake, and the daily bag limit is 15.
Do Washington statewide fishing rules apply on Isabella Lake?
Where Isabella Lake has its own rule for a species, that rule replaces the statewide limit. For species not listed on this page, Washington's statewide regulations apply. Regulations are set by the Washington Department of Fish and Wildlife; confirm with the official 2026 regulations before keeping a fish.
Other Washington waters with special regulations
- Yakima River · Benton
- Columbia River
- Wind River · Skamania
- Drano Lake · Skamania
- Naselle River · Pacific
- Roosevelt Lake · Ferry/Grant/Lincoln/Okanogan/Stevens
- Cowlitz River · Cowlitz/Lewis
- Green River · Duwamish
- Grays River · Wahkiakum
- Nisqually River · Pierce/Thurston
- Nooksack River · Whatcom
- Humptulips River · Grays Harbor
Take Isabella Lake rules on the water
Identify your catch, check if it's a keeper, and log it. CatchVault is on iOS, with Android on the way.