Mason Lake Fishing Regulations
Mason County, Washington · 2026 size limits, bag limits, and seasons
Mason 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 Mason Lake
Fish with special rules on Mason Lake
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Mason 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 Mason Lake trip
Mason Lake fishing: common questions
What fish have special regulations on Mason Lake?
4 species have rules specific to Mason Lake: Channel Catfish, Largemouth Bass, Smallmouth Bass, and Walleye.
What is the channel catfish limit on Mason Lake?
No size limit is listed for Channel Catfish on Mason Lake, and the daily bag limit is 10.
What is the largemouth bass limit on Mason Lake?
Largemouth Bass have a maximum size of 12" on Mason Lake, and the daily bag limit is 10.
What is the smallmouth bass limit on Mason Lake?
No size limit is listed for Smallmouth Bass on Mason Lake, and the daily bag limit is 15.
Do Washington statewide fishing rules apply on Mason Lake?
Where Mason 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 Mason 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.