Where is Lake Washington?

Lake Washington is a lake in Le Sueur County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.

How deep is Lake Washington?

Lake Washington has a maximum depth of 41.1 feet. The lake covers 1473 acres.

Are there boat ramps on Lake Washington?

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

Can I fish at Lake Washington?

Lake Washington 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 Minnesota's fish and wildlife agency, so check its current regulations before you go.

Lake Washington

Le Sueur County, Minnesota1,473 acresView map Directions

No nutrient or algae sampling on record from Minnesota PCA for this lake.

Max depth

41.1 ft

Bathymetric survey

Area

1,473 acres

Surface area

Shoreline

11.4 mi

Measured length

Impaired · Impaired biota (cause unknown)
41 ft max depth
Public access

See the measurements Directions Where to stay

Lake Washington in Le Sueur County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 41.1 ft. Surface area: 1473 acres.

Loading map…

Lake Washington is a 1,473-acre lake in Le Sueur County, Minnesota with a maximum depth of 41 feet. Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.

What Lake Washington is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Deep water41.1 ft surveyed max depth
Big water1,473 acres

Swimming conditions

No reading

Recreation use not supported

Nutrient and algae readings are not a swimming clearance. Lake Washington is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Whether Lake Washington is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Compare swimming lakes near Mankato →

Get alerts for Lake Washington →

Water quality measurements for Lake Washington

These are the measurements Minnesota PCA publishes for Lake Washington, 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 Lake Washington

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

Lake Details

Max depth

41.1 ft

Surface area

1,473 acres

Shoreline

11.4 mi

Public access

Yes

Listed by Minnesota PCA

The depth above comes from a bathymetric survey of this lake, not from a regional estimate.

Recreation & Access

Boat Landings

Yes

Public Access

Washington Lake (North)Public

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

Stays via Stay22

Stays near Lake Washington

Compare lakeside cabins, hotels, and vacation rentals near Lake Washington in Le Sueur County, Minnesota — 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 Lake Washington

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 whole trip? See where to stay at Minnesota’s top lakes →

Follow Lake Washington’s readings

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

Or email

Fishing Lake Washington

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

EPA Impairment Status

Lake Washington is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Impaired biota (cause unknown)MercuryNutrients (phosphorus, nitrogen)

Designated uses not supporting: Aquatic life, Fish consumption, Recreation.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN40-0117-00 · Official waterbody report

Nearby Lakes in Le Sueur County

Washington Lake4.5 ft clear · Eutrophic0.4 miView →Lake Emily2.4 miView →Dog Lake2.6 miView →Henry Lake2 ft clear—View →Jefferson Lake2 ft clear · Eutrophic—View →Savidge Lake—View →

Frequently asked questions about Lake Washington

Where is Lake Washington?: Lake Washington is a lake in Le Sueur County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Lake Washington?: Lake Washington in Le Sueur County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 41.1 ft. Surface area: 1473 acres.
Is Lake Washington safe to swim in?: Nutrient and algae readings are not a swimming clearance. Lake Washington is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Lake Washington?: Lake Washington has a maximum depth of 41.1 feet. The lake covers 1473 acres.
Are there boat ramps on Lake Washington?: Lake Washington has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Washington Lake (North). Public access is listed as yes.
Can I fish at Lake Washington?: Lake Washington 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 Minnesota's fish and wildlife agency, so check its current regulations before you go.