Where is Diamond Lake?

Diamond Lake is a lake in Pend Oreille County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.

How deep is Diamond Lake?

Diamond Lake has a maximum depth of 55 feet. The lake covers 753 acres.

Are there boat ramps on Diamond Lake?

Diamond Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Diamond Lake. Public access is listed as yes.

Can I fish at Diamond Lake?

Diamond Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Washington's fish and wildlife agency, so check its current regulations before you go.

Diamond Lake

Pend Oreille County, Washington753 acresView map Directions

No nutrient or algae sampling on record from Washington Ecology for this lake.

Max depth

55 ft

Bathymetric survey

Area

753 acres

Surface area

Shoreline

6.9 mi

Measured length

Impaired · Nuisance exotic species
55 ft max depth
Public access

See the measurements Directions Where to stay

Diamond Lake in Pend Oreille County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 55 ft. Surface area: 753 acres.

Loading map…

Diamond Lake is a 753-acre lake in Pend Oreille County, Washington with a maximum depth of 55 feet. Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, WA Ecology. Methodology: how these readings are compared.

What Diamond Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Deep water55 ft surveyed max depth

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Diamond Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.

Whether Diamond Lake is safe to swim in today is a call for the Washington State Department of Ecology and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Get alerts for Diamond Lake →

Water quality measurements for Diamond Lake

These are the measurements Washington Ecology publishes for Diamond Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about Diamond Lake

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

55 ft

Surface area

753 acres

Shoreline

6.9 mi

Public access

Yes

Listed by Washington Ecology

Recreation & Access

Boat Landings

Yes

Public Access

Diamond LakePublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Stays via Stay22

Stays near Diamond Lake

Compare lakeside cabins, hotels, and vacation rentals near Diamond Lake in Pend Oreille County, Washington — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Diamond 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? Cabins and lodging at Diamond Lake → · more Washington lake trips

Follow Diamond Lake’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Diamond Lake

→ Diamond Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Diamond Lake is officially listed as impaired under Clean Water Act §303(d) in the 2018 EPA reporting cycle (IR category 4C).

Causes of impairment

Nuisance exotic species

Designated uses not supporting: Aquatic life.

Source: EPA ATTAINS assessment unit WA17010308000657_001_001 · Official waterbody report

Nearby Lakes in Pend Oreille County

Mallard Marsh2 miView →Chain Lake5.1 miView →Mountain Meadows Lake4.9 miView →Indian Creek Fishing Pond8.8 miView →Davis Lake8 miView →Trask Pond8.2 miView →

Frequently asked questions about Diamond Lake

Where is Diamond Lake?: Diamond Lake is a lake in Pend Oreille County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.
What is the water quality of Diamond Lake?: Diamond Lake in Pend Oreille County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 55 ft. Surface area: 753 acres.
Is Diamond Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Diamond Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
How deep is Diamond Lake?: Diamond Lake has a maximum depth of 55 feet. The lake covers 753 acres.
Are there boat ramps on Diamond Lake?: Diamond Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Diamond Lake. Public access is listed as yes.
Can I fish at Diamond Lake?: Diamond Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Washington's fish and wildlife agency, so check its current regulations before you go.