Mayfield Lake Fishing Regulations
Lewis County, Washington · 2026 size limits, bag limits, and seasons
Mayfield Lake is a lake in Lewis County, Washington. It has its own fishing regulations for 18 species, including Atlantic Salmon, Brook Trout, Brown Trout, and Channel Catfish, set separately for 2 sections of the lake. These rules replace Washington's statewide limits on this water.
Map of Mayfield Lake
Fish with special rules on Mayfield Lake
Tap a fish for identification tips, size records, and the best bait.
Mayfield Lake limits by species (2026)
From Mayfield Dam to Onion Rock Bridge
| Species | Size limit | Daily bag | Season |
|---|---|---|---|
| All Fish SpeciesTwo-pole fishing not allowed | – | – | Always open |
 Atlantic SalmonHatchery fish only · Adult daily bag: 2 · Allowed species: Hatchery Chinook Salmon, Hatchery Coho Salmon | 12" min | 6 | Sep 1 – Dec 31 |
 Brook Trout | 8" min | 10 | Year-round |
 Brown Trout | 8" min | 10 | Year-round |
 Channel Catfish | – | 10 | Year-round |
 Chinook SalmonHatchery fish only · Adult daily bag: 2 · Allowed species: Hatchery Chinook Salmon, Hatchery Coho Salmon | 12" min | 6 | Sep 1 – Dec 31 |
 Coho SalmonHatchery fish only · Adult daily bag: 2 · Allowed species: Hatchery Chinook Salmon, Hatchery Coho Salmon | 12" min | 6 | Sep 1 – Dec 31 |
 Cutthroat Trout | 8" min | 10 | Year-round |
 Golden Trout | 8" min | 10 | Year-round |
 Lake Trout | 8" min | 10 | Year-round |
 Largemouth Bass1 over 17” may be retained. | 12" max | 10 | Year-round |
 Pink SalmonHatchery fish only · Adult daily bag: 2 · Allowed species: Hatchery Chinook Salmon, Hatchery Coho Salmon | 12" min | 6 | Sep 1 – Dec 31 |
 Rainbow Trout | 8" min | 10 | Year-round |
 Smallmouth BassOnly 1 over 14” may be retained. | – | 15 | Year-round |
 Sockeye SalmonHatchery fish only · Adult daily bag: 2 · Allowed species: Hatchery Chinook Salmon, Hatchery Coho Salmon | 12" min | 6 | Sep 1 – Dec 31 |
 Steelhead | 8" min | 10 | Year-round |
 WalleyeOnly 1 over 22” may be retained. | – | 16 | Year-round |
| Wild Cutthroat TroutWild fish only | – | Catch & release only | Year-round |
| Wild Rainbow TroutWild fish only | – | Catch & release only | Year-round |
From Mossyrock Dam downstream to the Tacoma Power safety signs at Onion Rock Bridge located just below the dam
| Species | Size limit | Daily bag | Season |
|---|---|---|---|
| All Fish Species | – | – | Year-round · Closed |
– means no limit is listed for this water. Rules not shown here follow Washington's statewide regulations.
Plan your Mayfield Lake trip
Mayfield Lake fishing: common questions
What fish have special regulations on Mayfield Lake?
18 species have rules specific to Mayfield Lake: Atlantic Salmon, Brook Trout, Brown Trout, Channel Catfish, Chinook Salmon, Coho Salmon, Cutthroat Trout, and Golden Trout, and 10 more.
What is the atlantic salmon limit on Mayfield Lake?
Atlantic Salmon must be at least 12" to keep on Mayfield Lake (from Mayfield Dam to Onion Rock Bridge), and the daily bag limit is 6. Season: Sep 1 – Dec 31.
What is the brook trout limit on Mayfield Lake?
Brook Trout must be at least 8" to keep on Mayfield Lake (from Mayfield Dam to Onion Rock Bridge), and the daily bag limit is 10.
What is the brown trout limit on Mayfield Lake?
Brown Trout must be at least 8" to keep on Mayfield Lake (from Mayfield Dam to Onion Rock Bridge), and the daily bag limit is 10.
Is Mayfield Lake catch and release?
Some rules on Mayfield Lake are catch and release only, covering Wild Cutthroat Trout and Wild Rainbow Trout. Check the table for the section and dates that apply.
Do Washington statewide fishing rules apply on Mayfield Lake?
Where Mayfield 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 Mayfield 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.