Riley Lake

2023 Trout Derby lake

Starting soon! For more information about how the trout derby works, important dates, and prizes, visit the 2023 Trout Derby page.

About ten miles east of Arlington. Fishing opportunities include stocked Rainbow Trout and resident Largemouth Bass.

This lake is one of only twelve waters in Snohomish County managed with a seasonal fishing closure. Spring catch rates for trout are highest early in the season and decline as fish are harvested and as warmer water temperatures force trout to seek areas of colder refuge. Fall is often overlooked by anglers, but can be an ideal time as fish that have been growing all summer become more active around the lake with cooler temperatures.

A WDFW access on the southwest corner offers boat launching with limited parking, and a toilet. Gasoline-powered motors are prohibited.

Two-pole fishing is allowed

Shoreline access: Good - WDFW access only

Species you might catch

Lake information

County: Snohomish
Acreage: 29.90 ac.
Elevation: 530 ft.
Center: 48.246402, -121.946916
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Fishing resources

Catchable fish plants
Release Location: RILEY LK (SNOH)
Stock Date Species Number Released Number of Fish Per Pound Facility
Apr 19, 2022 Rainbow 3,102 2.2 ARLINGTON HATCHERY
Apr 19, 2022 Rainbow 50 0.5 ARLINGTON HATCHERY
Apr 16, 2021 Rainbow 3,036 2.2 ARLINGTON HATCHERY
May 3, 2020 Rainbow 3,171 2.1 ARLINGTON HATCHERY
Apr 23, 2019 Rainbow 2,530 2.3 ARLINGTON HATCHERY
Apr 23, 2019 Rainbow 1,000 2.5 ARLINGTON HATCHERY
Apr 25, 2018 Rainbow 3,500 2.5 ARLINGTON HATCHERY
Apr 20, 2017 Rainbow 3,550 2.5 ARLINGTON HATCHERY
Apr 19, 2016 Rainbow 3,600 2.4 ARLINGTON HATCHERY
Apr 20, 2015 Rainbow 3,500 2.5 ARLINGTON HATCHERY
Visit the Catchable Trout Plants page for a more detailed search of trout plants in other bodies of water. To view and download the source data for this table visit the WDFW Fish Plants dataset on data.wa.gov.

Fishing prospects calendar

Rainbow trout

Fishing success for Rainbow Trout is generally best in the spring when thousands of fish are stocked statewide, but they can be caught year-round in most waters with a little patience and persistence. Success remains high into June and gradually declines as water temperatures increase and fish move offshore to stay cool. Fish that escaped the spring harvest return to the nearshore areas in the fall as waters cool off. Some waters may also be stocked again in the fall further boosting catch rates.
Chart showing fishing prospects throughout the calendar year

Largemouth bass

Fishing improves throughout the spring as waters warm and fish move onshore, peaking during the spawn. Summer is a slight lull though dawn/dusk hours can be very good. Catch improves in Fall as waters cool, vegetation begins to die back, and prey becomes more available. Winter is the hardest time because fish are offshore and slow moving.
Chart of fishing prospects throughout the calendar year