Where is Geist Reservoir?

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

Geist Reservoir

Marion County, Indiana1,153 acresView map Directions

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

Area

1,153 acres

Surface area

Impaired · Algal growth

See the measurements Directions Where to stay

Geist Reservoir in Marion County, Indiana has water-quality measurements published by IDEM, shown here as reported. Surface area: 1153 acres.

Loading map…

Geist Reservoir is a 1,153-acre lake in Marion County, Indiana.

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

What Geist Reservoir is good for

From access and monitoring records, not editorial picks.

Big water1,153 acres

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.

Compare swimming lakes near Indianapolis →

Get alerts for Geist Reservoir →

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.

Ask about Geist Reservoir

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

→ Geist Reservoir water level: the live USGS gauge reading

Lake Details

Surface area

1,153 acres

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

Stays via Stay22

Stays near Geist Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Geist Reservoir in Marion 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.

Top-rated places to stay near Geist Reservoir

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 Indiana’s top lakes →

Follow Geist Reservoir’s readings

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

Or email

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 Marion County

Indian Lake2.5 miView →Eagle Creek Reservoir—View →Geist Reservoir4.1 miView →Lake Woodland7.3 miView →Sugar Hills Lake Dam8.9 miView →Morse Reservoir13.7 miView →

Frequently asked questions about Geist Reservoir

Where is Geist Reservoir?: Geist Reservoir is a lake in Marion 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 Marion County, Indiana has water-quality measurements published by IDEM, shown here as reported. Surface area: 1153 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.