Lost Grove Lake Reservoir Report

Last Updated: December 13, 2025

Lost Grove Lake, located in Scott County, Iowa, is a state-owned reservoir with a primary purpose of recreation.


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Summary

The lake, completed in 2012, has a dam height of 75 feet and a length of 1165 feet, providing a maximum storage capacity of 9595 acre-feet. With a surface area of 350 acres and a drainage area of 7.1 square miles, Lost Grove Lake offers a picturesque setting for water resource and climate enthusiasts to explore and enjoy.

Managed by the Iowa Department of Natural Resources, Lost Grove Lake is regulated, permitted, inspected, and enforced by the state. The dam, constructed primarily of earth and stone, is designed to withstand high hazard potential and has been assessed as satisfactory in condition. The lake is fed by Lost Creek and is situated just 9 miles from the Mississippi River, offering ample recreational opportunities such as fishing, boating, and wildlife observation in a serene natural environment.

With its tranquil waters, scenic surroundings, and diverse recreational amenities, Lost Grove Lake is a hidden gem for outdoor enthusiasts seeking a peaceful retreat in the heart of Iowa. Whether you're a birdwatcher, angler, or simply enjoy basking in the beauty of nature, this reservoir provides a perfect escape to connect with the water resources and climate of the region. With its well-maintained infrastructure and commitment to safety and environmental stewardship, Lost Grove Lake promises a memorable experience for all who visit.

Year Completed

2012

Dam Length

1165

Dam Height

75

River Or Stream

Lost Creek

Primary Dam Type

Earth

Surface Area

350

Drainage Area

7.1

Nid Storage

9595

Hazard Potential

High

Foundations

Soil

Nid Height

75
       
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.