Larry Hopf Dam Reservoir Report

Last Updated: December 5, 2025

Larry Hopf Dam, located in Jasper-Offstream, Indiana, is a private earth dam constructed in 1978 with a primary purpose of recreation.


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Summary

Standing at a height of 45 feet and spanning 350 feet in length, the dam holds a storage capacity of 123 acre-feet. It is situated on Hall Creek and is regulated by the Indiana Department of Natural Resources, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.

Despite being classified as a low hazard potential structure, Larry Hopf Dam is rated as fair in its condition assessment. With a risk assessment of high (2), measures for risk management are yet to be specified. The dam, designed by USDA NRCS and owned by a private entity, provides opportunities for water resource and climate enthusiasts to explore its surrounding area, which includes a surface area of 4 acres and drainage area of 0.15 square miles. With its scenic location and recreational amenities, Larry Hopf Dam offers a unique experience for visitors interested in water conservation and environmental sustainability.

Year Completed

1978

Dam Length

350

Dam Height

45

River Or Stream

HALL CREEK

Primary Dam Type

Earth

Surface Area

4

Hydraulic Height

45

Drainage Area

0.15

Nid Storage

123

Structural Height

45

Outlet Gates

None

Hazard Potential

Low

Nid Height

45
       
Seasonal Comparison

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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.