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Mayfield Reservoir Fishing and Stocking

Lewis County, Washington. The Washington Department of Fish and Wildlife lists 23 stockings here in the latest year of its data (Rainbow Trout and Tiger Musky), the most recent on Aug 25, 2026. Stocked in April, May, June, July and August in two or more years.

2026 Stocking

DateSpeciesFishSize
Aug 25, 2026Rainbow Trout2,220Legals, 1.11 fish per pound
Aug 19, 2026Rainbow Trout2,320Legals, 1.16 fish per pound
Aug 11, 2026Rainbow Trout2,520Legals, 1.26 fish per pound
Aug 5, 2026Rainbow Trout1,534Legals, 1.17 fish per pound
Aug 5, 2026Rainbow Trout971Legals, 1.41 fish per pound
Jul 29, 2026Rainbow Trout2,660Legals, 1.33 fish per pound
Jul 21, 2026Rainbow Trout2,800Legals, 1.4 fish per pound
Jul 14, 2026Rainbow Trout2,500Legals, 1.25 fish per pound
Jul 9, 2026Rainbow Trout2,500Legals, 2.5 fish per pound
Jul 8, 2026Rainbow Trout3,120Legals, 1.56 fish per pound
Jun 30, 2026Rainbow Trout3,320Legals, 1.66 fish per pound
Jun 23, 2026Rainbow Trout2,980Legals, 1.49 fish per pound
Jun 16, 2026Rainbow Trout3,560Legals, 1.78 fish per pound
Jun 10, 2026Rainbow Trout1,764Legals, 1.75 fish per pound
Jun 10, 2026Rainbow Trout1,900Legals, 1.91 fish per pound
Jun 3, 2026Rainbow Trout1,872Legals, 1.85 fish per pound
Jun 3, 2026Rainbow Trout1,860Legals, 1.88 fish per pound
May 28, 2026Rainbow Trout5,940Legals, 2.7 fish per pound
May 21, 2026Rainbow Trout5,400Legals, 2.7 fish per pound
May 5, 2026Rainbow Trout4,800Legals, 2.4 fish per pound
May 4, 2026Tiger Musky1,200Legals, 3.39 fish per pound
Apr 9, 2026Rainbow Trout5,200Legals, 2.6 fish per pound
Apr 2, 2026Rainbow Trout5,400Legals, 2.7 fish per pound

2025 Stocking

DateSpeciesFishSize
Aug 26, 2025Rainbow Trout2,560Legals, 1.28 fish per pound
Aug 20, 2025Rainbow Trout2,665Legals, 1.32 fish per pound
Aug 11, 2025Rainbow Trout2,526Legals, 1.26 fish per pound
Aug 5, 2025Rainbow Trout2,767Legals, 1.38 fish per pound
Jul 29, 2025Rainbow Trout2,660Legals, 1.33 fish per pound
Jul 23, 2025Rainbow Trout2,860Legals, 1.43 fish per pound
Jul 16, 2025Rainbow Trout3,160Legals, 1.58 fish per pound
Jul 8, 2025Rainbow Trout3,120Legals, 1.56 fish per pound
Jul 2, 2025Rainbow Trout3,460Legals, 1.73 fish per pound
Jun 25, 2025Rainbow Trout3,552Legals, 1.77 fish per pound
Jun 18, 2025Rainbow Trout1,700Legals, 1.7 fish per pound
Jun 17, 2025Rainbow Trout1,700Legals, 1.7 fish per pound
Jun 11, 2025Rainbow Trout3,915Legals, 1.95 fish per pound
Jun 4, 2025Rainbow Trout4,105Legals, 2.05 fish per pound
May 29, 2025Rainbow Trout4,400Legals, 2.2 fish per pound
May 22, 2025Rainbow Trout4,400Legals, 2.2 fish per pound
May 5, 2025Tiger Musky1,233Legals, 3.2 fish per pound
May 1, 2025Rainbow Trout4,800Legals, 2.4 fish per pound
Apr 10, 2025Rainbow Trout5,400Legals, 2.7 fish per pound
Apr 3, 2025Rainbow Trout3,120Legals, 2.4 fish per pound
Apr 3, 2025Rainbow Trout2,100Legals, 3.0 fish per pound

2024 Stocking

DateSpeciesFishSize
Aug 28, 2024Rainbow Trout2,500Legals, 1.25 fish per pound
Aug 21, 2024Rainbow Trout2,486Legals, 1.24 fish per pound
Aug 13, 2024Rainbow Trout2,380Legals, 1.19 fish per pound
Aug 7, 2024Rainbow Trout2,680Legals, 1.34 fish per pound
Jul 31, 2024Rainbow Trout2,920Legals, 1.46 fish per pound
Jul 24, 2024Rainbow Trout2,620Legals, 1.31 fish per pound
Jul 17, 2024Rainbow Trout3,320Legals, 1.66 fish per pound
Jul 10, 2024Rainbow Trout3,280Legals, 1.64 fish per pound
Jul 3, 2024Rainbow Trout3,420Legals, 1.71 fish per pound
Jun 26, 2024Rainbow Trout1,810Legals, 1.8 fish per pound
Jun 26, 2024Rainbow Trout1,810Legals, 1.82 fish per pound
Jun 18, 2024Rainbow Trout3,900Legals, 1.96 fish per pound
Jun 12, 2024Rainbow Trout3,837Legals, 1.9 fish per pound
Jun 5, 2024Rainbow Trout4,080Legals, 2.03 fish per pound
May 22, 2024Rainbow Trout570Legals, 1.0 fish per pound
May 22, 2024Rainbow Trout7,889Legals, 2.3 fish per pound
May 6, 2024Tiger Musky106Legals, 3.18 fish per pound
Apr 18, 2024Rainbow Trout5,000Legals, 2.5 fish per pound
Apr 11, 2024Rainbow Trout5,000Legals, 2.5 fish per pound
Apr 4, 2024Rainbow Trout5,400Legals, 2.7 fish per pound

Other Stocked Waters in Lewis County

About This Data

Every row comes from the stocking information published by the Washington Department of Fish and Wildlife, checked Nov 3, 2026. The agency lists this water as “MAYFIELD RES (LEWI)”. Species and sizes are given as the agency names them; a dash means the agency does not say.

More for Washington Anglers

Stocking dates and places can change without notice; check with the agency before a trip. ReelTourney is not affiliated with the Washington Department of Fish and Wildlife.