Iowa Noname77 Reservoir Report

Last Updated: December 15, 2025

Iowa Noname77 is a locally-owned earth dam located in Marshalltown, Iowa, along the TR-LINN CREEK river or stream.


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Summary

Built in 1976 by CLAPSADDLE-GARBER ASSOC and USDA NRCS, this dam serves a variety of purposes beyond flood control, as indicated by its 'Other' primary purpose designation. With a dam height of 24 feet and a length of 800 feet, Iowa Noname77 has a normal storage capacity of 44 acre-feet and a maximum storage of 81 acre-feet across its 6.2-acre surface area.

Managed by the Iowa Department of Natural Resources, this low-hazard dam is regulated, inspected, and enforced by state authorities. Despite being rated as 'Not Rated' in terms of condition assessment, Iowa Noname77 is considered to have a moderate risk level (3) according to the available data. While the dam's emergency action plan status, risk management measures, and inundation maps remain unclear, the regulatory oversight and enforcement mechanisms in place provide a level of assurance for the surrounding community and environment. Water resource and climate enthusiasts can appreciate the complexities and implications of managing dams such as Iowa Noname77 within the broader context of sustainable water resource management and climate resilience efforts.

Year Completed

1976

Dam Length

800

Dam Height

24

River Or Stream

TR-LINN CREEK

Primary Dam Type

Earth

Surface Area

6.2

Drainage Area

0.21

Nid Storage

81

Hazard Potential

Low

Foundations

Soil

Nid Height

24
       
Seasonal Comparison

Weather Forecast

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.