Mayfield Lake fishing

Mayfield Lake fishing is stocked with Rainbow Trout on a reservoir. Also recorded: Tiger Muskie, Yellow Perch, Largemouth Bass, Coho Salmon, Chinook Salmon, Coastal Cutthroat Trout, and 3 more. It is stocked about 22 times a year since 2025, most often in June and July. Species guides list dawn and dusk for Rainbow Trout, Largemouth Bass, and Kokanee, dawn, day, and dusk for Yellow Perch, and dusk and night for Brown Bullhead.

Mayfield Lake
Photo: Tedder, CC BY-SA 4.0
Last stocked
August 25, 2026
· Rainbow Trout
Plants on record
43
Since 2025
Species stocked
1 (+9 also recorded)
Average size
11.3 in
Surface acres
2,021.9
Elevation
428 ft

Fish at Mayfield Lake

1 stocked · 9 confirmed present

Around the dates Mayfield Lake is stocked, Open-Meteo's 2016-2025 archive puts mean air temperature at 60.1°F in June, 66°F in July, 67.4°F in August, 55.5°F in May. That is air temperature at these coordinates, not water temperature. Open-Meteo

Rainbow Trout Stocked · 43 plants · last August 25, 2026 Best: dawn, dusk

Last stocked August 25, 2026 · avg 11.3 in · 43 plants

Best: dawn, dusk

Rainbow Trout species guide

The lake is home to tiger muskies, which were introduced in 1993 to help control northern pikeminnow populations. Anglers can also find largemouth bass, kokanee, and rainbow trout in the lake. The Tilton River arm is much warmer and shallower, while the Cowlitz River Arm is significantly colder. (en.wikipedia.org, accessed September 22, 2026)(parks.wa.gov, accessed September 22, 2026)

Drafted by AI from the cited sources and checked before publishing.

How Mayfield Lake is stocked

Source: Washington Department of Fish and Wildlife.

About 68 reported fish per acre, the fewest of 9 lakes in Lewis County with both a fish count and a surface area.

Fish stocked in 2025

64,970

Fish stocked in 2026

72,001

Stocking history

Source: Washington Department of Fish and Wildlife.
Date Species Quantity Avg. length Source
August 25, 2026Rainbow Trout2,22012.8 inreport
August 19, 2026Rainbow Trout2,32012.7 inreport
August 11, 2026Rainbow Trout2,52012.5 inreport
August 5, 2026Rainbow Trout97112.2 inreport
August 5, 2026Rainbow Trout1,53412.7 inreport
July 29, 2026Rainbow Trout2,66012.3 inreport
July 21, 2026Rainbow Trout2,80012.2 inreport
July 14, 2026Rainbow Trout2,50012.5 inreport
July 9, 2026Rainbow Trout2,50010 inreport
July 8, 2026Rainbow Trout3,12011.9 inreport
June 30, 2026Rainbow Trout3,32011.7 inreport
June 23, 2026Rainbow Trout2,98012 inreport
June 16, 2026Rainbow Trout3,56011.4 inreport
June 10, 2026Rainbow Trout1,90011.2 inreport
June 10, 2026Rainbow Trout1,76411.5 inreport
June 3, 2026Rainbow Trout1,86011.2 inreport
June 3, 2026Rainbow Trout1,87211.3 inreport
May 28, 2026Rainbow Trout5,9409.6 inreport
May 28, 2026Rainbow Trout4,8609.6 inreport
May 21, 2026Rainbow Trout5,4009.6 inreport
May 5, 2026Rainbow Trout4,80010.2 inreport
April 9, 2026Rainbow Trout5,2009.8 inreport
April 2, 2026Rainbow Trout5,4009.6 inreport
August 26, 2025Rainbow Trout2,56012.4 inreport
August 20, 2025Rainbow Trout2,66512.4 inreport
August 11, 2025Rainbow Trout2,52612.5 inreport
August 5, 2025Rainbow Trout2,76712.2 inreport
July 29, 2025Rainbow Trout2,66012.3 inreport
July 23, 2025Rainbow Trout2,86012.1 inreport
July 16, 2025Rainbow Trout3,16011.8 inreport
July 8, 2025Rainbow Trout3,12011.9 inreport
July 2, 2025Rainbow Trout3,46011.5 inreport
June 25, 2025Rainbow Trout3,55211.5 inreport
June 18, 2025Rainbow Trout1,70011.6 inreport
June 17, 2025Rainbow Trout1,70011.6 inreport
June 11, 2025Rainbow Trout3,91511.1 inreport
June 4, 2025Rainbow Trout4,10510.9 inreport
May 29, 2025Rainbow Trout4,40010.6 inreport
May 22, 2025Rainbow Trout4,40010.6 inreport
May 1, 2025Rainbow Trout4,80010.2 inreport
April 10, 2025Rainbow Trout5,4009.6 inreport
April 3, 2025Rainbow Trout3,12010.2 inreport
April 3, 2025Rainbow Trout2,1009 inreport

Access and facts

Water type
reservoir
Nearest town
Mossyrock
Facilities
restrooms, camping

Cowlitz River reservoir three miles west of Mossyrock. Boats launch at Tacoma Power's Mayfield Lake Park off US 12 (Beach Road), at Ike Kinswa State Park, and at a private resort. WDFW notes fair bank access at the state park and near the Mossyrock Trout Hatchery; other public shore is limited.

Drafted by AI from the cited sources and checked before publishing.

View larger map · Open in Google Maps · Directions

Advisories, closures, regulations and water conditions change. Check the Washington Department of Fish and Wildlife before you go.

About Mayfield Lake

Those using the Ike Kinswa watercraft launch should use caution, as it ends abruptly due to a material wash out at the base of the concrete ramp. This has resulted in a 10-inch drop at the end of the ramp. (parks.wa.gov, accessed September 22, 2026)

Drafted by AI from the cited sources and checked before publishing.

Photo of Mayfield Lake
Tedder, CC BY-SA 4.0
Photo of Mayfield Lake
U.S. Forest Service- Pacific Northwest Region, Public domain
Photo of Mayfield Lake
Tedder, CC BY-SA 4.0

Nearest lakes

Swofford Pond 6.8 mi last stocked May 20, 2026 Carlisle Lake 9.6 mi last stocked April 23, 2026 South Lewis County Park Pond 16.8 mi last stocked May 28, 2026 Clear Lake 19.4 mi last stocked April 22, 2026 Mineral Lake 21 mi last stocked July 14, 2026

Public land at Mayfield Lake

Mayfield Lake is 0.1 miles outside the edge of Ike Kinswa State Park.

Boundaries from Public Lands DB, part of the same network.

Common questions

What fish are at Mayfield Lake?

Fishing Mayfield Lake usually means Rainbow Trout. All 43 plants on record are Rainbow Trout. Rainbow Trout was last stocked August 25, 2026, averaging 11.3 in. Tiger Muskie, Yellow Perch, Largemouth Bass, and Coho Salmon, plus 5 more are recorded here outside the stocking reports.

When is Mayfield Lake stocked?

Last stocked August 25, 2026. It is stocked about 22 times a year since 2025, most often in June and July. About 68 reported fish per acre, the fewest of 9 lakes in Lewis County with both a fish count and a surface area.

How big are the fish stocked at Mayfield Lake?

Rainbow Trout stocked at Mayfield Lake average 11.3 in.

How do you get on Mayfield Lake?

The nearest town is Mossyrock. Facilities include restrooms and camping. Cowlitz River reservoir three miles west of Mossyrock. Boats launch at Tacoma Power's Mayfield Lake Park off US 12 (Beach Road), at Ike Kinswa State Park, and at a private resort. WDFW notes fair bank access at the state park and near the Mossyrock Trout Hatchery; other public shore is limited.

Sources (4) +