1e Reservoir Report

Last Updated: December 5, 2025

1e is a privately owned earth dam located in Pottawatomie, Kansas, along the Pleasant Run-TR river/stream.


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Summary

This dam, designed by DeHaan, Grabs & Assoc in Mandan, ND, serves a primary purpose of "Other" and has a low hazard potential. With a hydraulic height of 21 feet and a structural height of 32 feet, 1e has a storage capacity of 124 acre-feet and a drainage area of 0.14 square miles.

Despite being in a state-regulated jurisdiction, 1e is not subject to state permitting, inspection, or enforcement. The dam has a controlled spillway with a width of 40 feet and a maximum discharge of 300 cubic feet per second. The risk assessment for 1e is very high, with a risk level of 1, and the condition assessment is currently not rated. The dam is not operated by a federal agency and does not have any associated structures or federal funding.

Overall, 1e presents a unique case study for water resource and climate enthusiasts due to its privately owned status, low hazard potential, and very high risk assessment. With its controlled spillway and storage capacity of 124 acre-feet, 1e serves as a key structure in managing water flow along the Pleasant Run-TR river/stream in Pottawatomie, Kansas. Its design by DeHaan, Grabs & Assoc and lack of federal oversight offer an intriguing look at the intersection of private ownership and dam regulation in the United States.

Dam Length

1400

Dam Height

25

River Or Stream

PLEASANT RUN-TR

Primary Dam Type

Earth

Surface Area

7

Hydraulic Height

21

Drainage Area

0.14

Nid Storage

124

Structural Height

32

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

32
       
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.