3 lakes with water-quality readings within 4 hr of downtown
Driving from Seattle to a lake worth swimming in
Weallup Lake is the closest lake with water-quality readings to Seattle, 1 hr 7 min away. Moses Lake has clear, low-nutrient readings and takes 3 hr 23 min, 2 hr 16 min more in the car, each way, for cleaner water.
Every lake below is ranked by how long the drive is, and each links to its own water-quality readings. Closest is not the same as cleanest, and this page will not pretend otherwise.
Closer, or cleaner — the whole ladder
3 lakes, sorted by drive time from downtown Seattle. 1 of them have clear, low-nutrient readings. The furthest entry is Moses Lake at 3 hr 23 min.
| Drive | Lake | Road miles | County | Size | Access |
|---|---|---|---|---|---|
| 1 hr 7 min | Weallup Lake | 44.9 | Snohomish County, WA | Not recorded | Not recorded |
| 3 hr 8 min | Rimrock Reservoir | 123.6 | Yakima County, WA | 2,525 ac | ✓ Public |
| 3 hr 23 min | Moses Lake | 175.7 | Grant County, WA | Not recorded | ✓ Public |
What the numbers are, and are not
Drive times and road miles are one-way road routing from downtown Seattle to the nearest public road at each lake, over the OpenStreetMap network via OSRM (router.project-osrm.org) over OpenStreetMap, driving profile, free-flow. Free-flow means no traffic model and no time of day, so a weekend morning will beat these numbers and a Friday afternoon will not.
Each lake’s water-quality readings, phosphorus, nitrogen, chlorophyll-a and turbidity measured over years by state and federal agencies, are on its own page. They describe the lake’s record; they do not clear the water for a particular afternoon, and they say nothing about the beach, the boat ramp or the view. Lakes with no nutrient or algae reading on record are not listed here, because the water is the only axis this page ranks on.
Size and access come from the lake record where the agency published them. “Not recorded” means nobody documented it — it is a gap in the paperwork, not a statement about the lake.
More lakes near Seattle
Nearby cities
Common questions
Frequently Asked Questions
Moses Lake in Grant County, Washington. Its nutrient and algae readings are among the most favourable within reach, and the drive is 3 hr 23 min, or 175.7 road miles. The closest lake of any kind with readings on record is Weallup Lake at 1 hr 7 min.
2 hr 16 min each way. Weallup Lake is 1 hr 7 min out; Moses Lake, with the more favourable readings, is 3 hr 23 min out.
2 of the 3 lakes here have a public access point on the record, and the closest is Rimrock Reservoir, 3 hr 8 min away. The rest of the table shows "Not recorded" where no access point was documented, which is not the same as no access — check with the managing agency before you trailer a boat.
By road, from downtown Seattle to the nearest public road at each lake, over the OpenStreetMap road network. They are free-flow times: no traffic, no time of day, no stops. Treat them as the floor, and add for rush hour and for the last stretch to the water.
No. The readings summarise years of phosphorus, nitrogen, algae and turbidity measurements; they describe the lake, not this afternoon. A beach closure, a bloom, or a heavy rain can change conditions overnight. Whether a lake is safe to swim in is a call for the state water agency and the county health department: check the lake's own page for its measurement record, and check the managing agency for current advisories before you get in.
Stay by the water, not by the highway
Cabins, hotels and rentals around Moses Lake in Grant County, the closest lake to Seattle with the most favourable readings in range. 3 hr 23 min from downtown.
Top-rated places to stay near Moses Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Moses Lake?
Get lake water-quality updates plus the best cabin & lodging deals near Moses Lake — straight to your inbox. No spam, unsubscribe anytime.