Knowlton Reservoir Report

Last Updated: December 5, 2025

Knowlton, also known as Ringy Dingy, is a state-owned dam located in Bynum, Montana, along Rinker Creek.


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Summary

Built in 1910 for irrigation purposes, this earth dam stands at 12 feet high with a storage capacity of 166 acre-feet. Despite its age, Knowlton has a low hazard potential and has not been rated for its condition. The dam is regulated by the Montana Department of Natural Resources and Conservation, with regular inspections to ensure its safety and functionality.

Situated in Teton County, Montana, Knowlton plays a crucial role in providing water for agricultural purposes in the region. With a maximum storage capacity of 166 acre-feet and a hydraulic height of 8 feet, this dam helps manage water resources for the surrounding area. Although it has not undergone any significant modifications in recent years, the dam continues to serve its intended purpose effectively, contributing to the irrigation needs of the local community.

Knowlton's location in Congressional District 00, Montana, highlights its importance in water resource management within the state. As a state-regulated structure with oversight from the DNRC, this dam ensures the sustainable use of water from Rinker Creek for irrigation purposes. With its historical significance and ongoing role in supporting agricultural activities, Knowlton stands as a vital infrastructure for water resource and climate enthusiasts to study and appreciate in the context of Montana's water management efforts.

Year Completed

1910

Dam Length

75

Dam Height

12

River Or Stream

RINKER CREEK

Primary Dam Type

Earth

Hydraulic Height

8

Nid Storage

166

Hazard Potential

Low

Nid Height

12
       
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.