Hamilton Lake
Steuben County, Indiana835 acresView mapDirections
IDEM publishes the water-quality measurements for Hamilton Lake. Here is what has been measured.
- Impaired · Nutrients (phosphorus, nitrogen)
- 70 ft max depth
- Public access
- Limited data
Hamilton Lake in Steuben County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 78.8 µg/L. Chlorophyll-a (algae): 0.8 µg/L. Maximum depth: 69.9 ft. Surface area: 835 acres.
Hamilton Lake is a 835-acre lake in Steuben County, Indiana with a maximum depth of 70 feet (21-foot average). Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, IDEM, last sampled 2026-09-07. Methodology: how these readings are compared.
What Hamilton Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Deep water69.9 ft surveyed max depth
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Hamilton Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pCBs. Check local advisories before you swim.
Whether Hamilton Lake 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.
Water quality measurements for Hamilton Lake
These are the measurements IDEM publishes for Hamilton 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. Phosphorus 78.8 µg/L. Chlorophyll-a 0.8 µg/L.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 78.8µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 0.8µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
Ask about Hamilton Lake
Answers come straight from the public measurements and survey records on this page.
→ Hamilton Lake water level: the live USGS gauge reading
Lake Details
Max depth
69.9 ft
Average depth
21 ft
Surface area
835 acres
Shoreline
13.9 mi
Public access
Yes
Listed by IDEM
Recreation & Access
- Pigeon River Fish & Wildlife AreaPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Hamilton Lake
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Fishing Hamilton Lake
EPA Impairment Status
Hamilton Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption, Recreation.
Source: EPA ATTAINS assessment unit INA03P1011_00 · Official waterbody report
Nearby Lakes in Steuben County
Frequently asked questions about Hamilton Lake
Where is Hamilton Lake?
- Hamilton Lake is a lake in Steuben County, Indiana. Its water-quality measurements are published by IDEM and shown on this page as reported.
What is the water quality of Hamilton Lake?
- Hamilton Lake in Steuben County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 78.8 µg/L. Chlorophyll-a (algae): 0.8 µg/L. Maximum depth: 69.9 ft. Surface area: 835 acres.
Is Hamilton Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Hamilton Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pCBs. Check local advisories before you swim.
How deep is Hamilton Lake?
- Hamilton Lake has a maximum depth of 69.9 feet and an average depth of 21 feet. The lake covers 835 acres.
Are there boat ramps on Hamilton Lake?
- Hamilton Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Pigeon River Fish & Wildlife Area. Public access is listed as yes.
Can I fish at Hamilton Lake?
- Hamilton Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Indiana's fish and wildlife agency, so check its current regulations before you go.
Explore Hamilton Lake across LakeQuality
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Where this data comes from
Measurements for Hamilton Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory