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

Arizona, 69 lakes — no lake here has enough monitoring data for a grade

Coconino County has 69 monitored lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the measurements reflect that mix. No lake in Coconino County has enough sampling behind it for an A–F grade yet. The 69 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 Coconino County

Top-rated places to stay near Coconino County

Prices for Sep 11–13, 4 adults. Change dates on the map below.

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Quick Answers for Coconino County

Cleanest lakes in Coconino County →Safest swimming lakes in Arizona →

Planning a trip? Check special fishing regulations for Woods Canyon Lake — or check the official Arizona fishing regulations.

All Lakes in Coconino County

69 lakes · 0 graded, 69 not rated0 graded lakes · 69 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
NRWoods Canyon LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRBear Canyon LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRSante Fe LakeCoconinoNR2.3 ft69 µg/LNo recent samplesNo recent samples✓ Public
NRWhitehorse LakeCoconinoNR1.6 ft190 µg/LNo recent samplesNo recent samples✓ Public
NRKinnikinick LakeCoconinoNR0.5 ft210 µg/LNo recent samplesNo recent samplesNot recorded
NRCataract LakeCoconinoNR4.6 ft260 µg/LNo recent samplesNo recent samples✓ Public
NRAshurst LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake MaryCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRKaibab LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRWillow Springs LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake PowellCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NROwl Tank LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDogtown ReservoirCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLaguna LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNational TankCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPasture Canyon ReservoirCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLittle Red LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRed LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRed Lake TankCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRStone LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSmoot LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHoward LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDavenport LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDry LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGonzalez LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHolden LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFry LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRScholz LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRogers LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRElaine LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROdell LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGrass Flat TankCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMormon LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCorner LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDucksnest LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBreezy LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRIndian LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPost LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPerry LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDeep LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAls LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPotato LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRVail LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRYoungs LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHorse LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMarshall LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLower Lake MaryCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLong LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBoot LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMcDermit LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRed LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDaze LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHay LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTremaine LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSoldier Annex LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLong LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRMorton LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCow LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMud LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPine LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRStoneman LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRC.C. Cragin ReservoirCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMoonlight Bay ReservoirCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWhite Water TankCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTo Kla Daa Aakee PondCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChevelon Canyon LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKnoll LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRWoods Canyon LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWillow Springs LakeCoconinoNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public

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 Arizona

Pinal County

3 lakes · Avg grade B

Maricopa County

16 lakes · Avg grade B

Pima County

9 lakes · Avg grade C

Yuma County

3 lakes · Avg grade D

Yavapai County

13 lakes · Avg grade D

Apache County

59 lakes · Not rated

See how Coconino 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.