Where is Geist Reservoir?

Geist Reservoir is a lake in Hamilton County, Indiana. Its water-quality measurements are published by IDEM and shown on this page as reported.

Geist Reservoir

Hamilton County, Indiana181 acresView map Directions

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

Area

181 acres

Surface area

Impaired · Algal growth

See the measurements Directions Where to stay

Geist Reservoir in Hamilton County, Indiana has water-quality measurements published by IDEM, shown here as reported. Surface area: 181 acres.

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Geist Reservoir is a 181-acre lake in Hamilton County, Indiana.

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

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Geist Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, pCBs. Check local advisories before you swim.

Whether Geist Reservoir is safe to swim in today is a call for the Indiana Department of Environmental Management and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Geist Reservoir

These are the measurements IDEM publishes for Geist Reservoir, 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.

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

Lake Details

Surface area

181 acres

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

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Stays near Geist Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Geist Reservoir in Hamilton County, Indiana — 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.

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Fishing Geist Reservoir

→ Geist Reservoir fishing regulations (limits, seasons, special rules)

EPA Impairment Status

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

Causes of impairment

Algal growthPCBs

Designated uses not supporting: Aquatic life, Fish consumption.

Source: EPA ATTAINS assessment unit INW01P1048_00 · Official waterbody report

Nearby Lakes in Hamilton County

Lake Woodland10.3 miView →Morse Reservoir12.9 miView →Geist Reservoir4.1 miView →Indian Lake6.2 miView →Sugar Hills Lake Dam7.6 miView →Wurster Lake—View →

Frequently asked questions about Geist Reservoir

Where is Geist Reservoir?: Geist Reservoir is a lake in Hamilton County, Indiana. Its water-quality measurements are published by IDEM and shown on this page as reported.
What is the water quality of Geist Reservoir?: Geist Reservoir in Hamilton County, Indiana has water-quality measurements published by IDEM, shown here as reported. Surface area: 181 acres.
Is Geist Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Geist Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, pCBs. Check local advisories before you swim.