Silver Lake (WA): Motor and Boating Rules
Whatcom County · near Maple Falls · managed by Whatcom County
- Gas outboard YES
- Electric trolling YES
- PWC / jet ski NO
- Whatcom County, WA
- 10 hp cap
- Whatcom County
Quick answer
Silver Lake carries a 10 hp cap. The rated horsepower on your motor's plate is what counts. Common portables — 2.5 to 9.9 hp — fit under it. Silver Lake in WA is limited to outboard motors of 10 horsepower or less under Whatcom County regulations (verified July 26, 2026). Note the wake rule: Idle speed/no wake lake-wide from the fishing season opening day through May 20. Rules change and local ordinances may add restrictions — always confirm with Whatcom County before you launch.
Rules at a glance
Plate rating counts — motors rated above 10 hp are over the cap even at idle.
What this means in practice
A 10 hp cap covers most portable outboards — the common 2.5, 4, 6, and 9.9 hp models all fit under a 10 hp-style limit. Check the plate on your motor: the rated horsepower stamped there is what counts, not how gently you throttle.
PWC exceed a low horsepower cap by design, so the limit on Silver Lake effectively excludes jet skis. Electric trolling motors sit comfortably inside any horsepower cap and are a common quiet-water choice here.
Hours matter here too: the posted rule is "May 21-June 30: no wake before 10:00 a.m. and after 7:00 p.m.". Outside those hours, the stricter behavior applies — plan dawn and dusk trips around it on Silver Lake.
Worth knowing about Silver Lake: Whatcom County Code 11.32.030 states that use of motorized vessels with more than 10 horsepower is prohibited on Silver Lake, imposes seasonal idle/no-wake periods, and allows water skiing only in a counterclockwise direction..
Two more Washington waters worth a look while you plan: Pass Lake (No motors, Skagit County) and Battle Ground Lake (Electric only, Clark County). For the complete picture, all verified Washington lake motor rules sit on one sortable page.
Common mistakes on HP limit water
Forgetting auxiliary motors count. Where the rule caps the motor or combination of motors, a kicker plus main can bust the number together. Check the wording in the source.
Missing the wake rule stacked on top. Horsepower caps often travel with idle-speed or no-wake conditions — the table above lists what applies on Silver Lake.
Before you launch — verify
- Official rules: Whatcom County
- Unsure about a detail? Call the Whatcom County district office that covers Whatcom County before towing your boat out.
- We last verified this page on .
Rules change and local ordinances may add restrictions — always confirm with Whatcom County before you launch.
Frequently asked questions
Are gas motors allowed on Silver Lake?
Yes, within the 10 hp limit. Outboards rated above 10 horsepower are prohibited on Silver Lake. A wake rule also applies: Idle speed/no wake lake-wide from the fishing season opening day through May 20. Verified July 26, 2026.
Can I use an electric trolling motor on Silver Lake?
Yes. Electric trolling motors are allowed on Silver Lake. A transom-mount motor in the 30–55 lb thrust range with a deep-cycle battery is the typical setup for this class of water.
Are jet skis (PWC) allowed on Silver Lake?
No — PWC cannot legally run here. Their engines are rated far above the 10 hp cap on Silver Lake.
Who enforces boating rules on Silver Lake?
The rules summarized here come from Whatcom County (county government), with possible additional ordinances from Whatcom County or local municipalities. Any peace officer can cite violations, so treat posted rules as enforceable regardless of who is watching.
Where do I verify the current rules for Silver Lake?
The Sources section links the exact regulation we summarized, and Whatcom County publishes the live version. This page was last checked against it on July 26, 2026.