Reservoir Report

Indiana

Last Updated: May 6, 2026

Nearby: Hamilton Lake-South Dam Mcnamara Corporation Lake

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Hamilton Lake in Indiana was created in 1837 as a result of a dam being built on the headwaters of the Wabash River.

Summary

The lake covers 800 acres and has an average depth of 25 feet. It is supplied by a combination of surface flow and snowpack from the surrounding area. The lake is a popular destination for recreational activities such as swimming, boating, and fishing. Agricultural uses include irrigation for nearby crops. In recent years, a focus has been put on improving the water quality of the lake through measures such as controlling nutrient runoff from surrounding farms. The lake is also home to a variety of wildlife, including fish, waterfowl, and turtles.

Regional Streamflow Levels

Fish Creek At Hamilton 34.6cfs	35cfs
St. Joseph River Near Newville 952.0cfs	952cfs
Pigeon Creek Nr Angola 158.0cfs	158cfs
Cedar Creek At 18th Street At Auburn 96.5cfs	97cfs
West Branch St. Joseph River Nr Nettle Lake 144.0cfs	144cfs
Unnamed Tributary To Lost Creek Near Farmers Oh 1.62cfs	2cfs

15-Day Long Term Forecast

Reservoir Details

Gage Height, Ft 24hr Change	-0.11%
Percent of Normal	100%
Minimum	7.13 ft 2011-10-13
Maximum	9.72 ft 2009-03-12
Average	9 ft
Dam_Height	16
Hydraulic_Height	16
Drainage_Area	16.5
Year_Completed	1832
Nid_Storage	18000
Structural_Height	16
Primary_Dam_Type	Earth
Surface_Area	755.39
Outlet_Gates	None
River_Or_Stream	FISH CREEK
Dam_Length	104
Hazard_Potential	High
Nid_Height	16

Seasonal Comparison

Gage Height, Ft Levels

5-Day Hourly Forecast Detail

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.