Grade Lake is a lake in Clarke County, Iowa. Its water-quality measurements are published by Iowa DNR and shown on this page as reported.

Grade Lake

Clarke County, Iowa25 acresView map Directions

No nutrient or algae sampling on record from Iowa DNR for this lake.

Area

25 acres

Surface area

Shoreline

1.2 mi

Measured length

Impaired · Mercury

See the measurements Directions Where to stay

Grade Lake in Clarke County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. Surface area: 25 acres.

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

Swimming conditions

No reading

Recreation use not supported

Nutrient and algae readings are not a swimming clearance. Grade Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.

Whether Grade Lake is safe to swim in today is a call for the Iowa Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Grade Lake

These are the measurements Iowa DNR publishes for Grade 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 Grade Lake

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

Lake Details

Surface area

25 acres

Shoreline

1.2 mi

No bathymetric survey has been published for Grade Lake, so its depth is not documented here.

Stays via Stay22

Stays near Grade Lake

Compare lakeside cabins, hotels, and vacation rentals near Grade Lake in Clarke County, Iowa — 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 Grade Lake

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Fishing Grade Lake

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

EPA Impairment Status

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

Causes of impairment

Mercury

Designated uses not supporting: Recreation.

Source: EPA ATTAINS assessment unit IA 04-LDM-6311 · Official waterbody report

Nearby Lakes in Clarke County

East Lake Osceola1.2 ft clear · Hypereutrophic1.6 miView →West Lake Osceola2.2 ft clear · Eutrophic2.1 miView →Little River Lake2.3 ft clear · Hypereutrophic18.8 miView →Thayer Lake3.5 ft clear · Hypereutrophic15.3 miView →Humeston Reservoir1.6 ft clear · Hypereutrophic16.9 miView →Hooper Pond Lake2.5 ft clear · Eutrophic20 miView →

Frequently asked questions about Grade Lake

Where is Grade Lake?: Grade Lake is a lake in Clarke County, Iowa. Its water-quality measurements are published by Iowa DNR and shown on this page as reported.
What is the water quality of Grade Lake?: Grade Lake in Clarke County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. Surface area: 25 acres.
Is Grade Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Grade Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.