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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water
NR

Franklin County Lake Quality

Washington, 17 lakes — no lake here has enough monitoring data for a grade

There are 17 monitored lakes in Franklin County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. No lake in Franklin County has enough sampling behind it for an A–F grade yet. The 17 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.

Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.

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Where to stay near Franklin County

Top-rated places to stay near Franklin County

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Quick Answers for Franklin County

Cleanest lakes in Franklin County →Safest swimming lakes in Washington →

Planning a trip? Check special fishing regulations for Scooteney Reservoir Boat Ramp — or check the official Washington fishing regulations.

All Lakes in Franklin County

17 lakes · 0 graded, 17 not rated0 graded lakes · 17 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
NRScooteney Reservoir Boat RampFranklinNRNo recent samples41 µg/LNo recent samplesNo recent samples✓ Public
NRCamp LakesFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSnakebite ReservoirFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREagle LakesFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREagle LakesFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREagle LakesFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREagle LakesFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSulphur LakeFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWashtucna LakeFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake KahlotusFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREmma LakeFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDalton LakeFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake WallulaFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake WallulaFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRClark PondFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMesa LakeFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake Herbert G WestFranklinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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Other Counties in Washington

Lincoln County

22 lakes · Avg grade A

Grant County

48 lakes · Avg grade A

Whatcom County

34 lakes · Avg grade B

Yakima County

23 lakes · Avg grade C

Snohomish County

52 lakes · Avg grade C

Thurston County

29 lakes · Avg grade D

See how Franklin County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: EPA National Aquatic Resource Surveys, 2026.