When was Mason Lake last stocked?

The latest reported stocking was Aug 9, 2026 (rainbow trout, 820 fish), according to Washington agency reports.

How often is Mason Lake stocked?

It was stocked 1 times in the last 12 months.

What kind of trout are stocked in Mason Lake?

Rainbow trout (1 stocking, 820 fish).

Mason Lake trout stocking

King County, Washington · lake

Mason Lake was last stocked 7 weeks ago (Aug 9, 2026). We have 1 stocking on record since Aug 9, 2026, 1 in the last 12 months (820 fish). Species stocked: rainbow trout.

Last stocked

7 weeks ago

Aug 9, 2026

Next planned

Not announced

Last 12 months

1 stocking

820 fish

On record

1 stockings

since Aug 9, 2026

River conditions

Nearest USGS gage: SF SNOQUALMIE RIVER AB ALICE CREEK NEAR GARCIA, WA (3 km away, on a different stream or lake).

Flow: 23 cfs; about normal for the last six weeks
Gage height: 9.36 ft

Streamflow, last six weeks (cfs), daily. Latest: 24 cfs on Sep 23.

Latest reading Sep 25, 2026, 3:15 AM UTC. USGS data are provisional. Gage page at USGS.

Weather at Mason Lake

Tonight
46°F
Light Rain
79% rain · wind 2 mph
Friday
49°F
Showers And Thunderstorms
100% rain · wind 2 to 7 mph
Friday Night
38°F
Rain
89% rain · wind 1 to 9 mph
Saturday
50°F
Partly Sunny
wind 2 mph
Saturday Night
37°F
Mostly Cloudy
wind 1 to 5 mph
Sunday
53°F
Mostly Sunny
1% rain · wind 0 to 5 mph

Forecast from the National Weather Service for this location, refreshed hourly.

What is stocked

Species	Stockings	Fish	Fish per stocking	Typical size
Rainbow trout	1	820	820

Stocking history

Date	Species	Fish	Pounds	Hatchery
Aug 9, 2026	Rainbow trout	820	2	Tokul Cr Hatchery

From Washington fish and wildlife agency reports, collected nightly and kept after the agency takes them down. Agencies revise reports; check the agency's report before you go.

Where is Mason Lake?

King County, Washington. Approximate: the marker is the USGS place-name point for this water, not an agency location.

Directions Larger map

Stocked waters near Mason Lake

Kulla Kulla Lakelake · 1 mistocked Jun 21, 2025
Island Lakelake · 1 mistocked Sep 17, 2025
Windy Lakelake · 3 mistocked Sep 18, 2025
Alice Lakeslake · 4 mistocked Jul 22, 2025
Lake Carolinelake · 5 mistocked Sep 12, 2025
Lodge Lakelake · 6 mistocked Jul 31, 2026
Divide Lakelake · 6 mistocked Jul 23, 2025
Rockdale Lakelake · 6 mistocked Oct 14, 2025

All stocked waters in King County Stocked this week in Washington

Questions about Mason Lake

When was Mason Lake last stocked?: The latest reported stocking was Aug 9, 2026 (rainbow trout, 820 fish), according to Washington agency reports.
How often is Mason Lake stocked?: It was stocked 1 times in the last 12 months.
What kind of trout are stocked in Mason Lake?: Rainbow trout (1 stocking, 820 fish).