Blanding City No. 4 Reservoir Report

Reservoir Report

Utah

Nearby: Blanding City No. 3 Starvation Canyon

Last Updated: December 5, 2025

Blanding City No.

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Summary

4 is a crucial water resource infrastructure owned by the local government in San Juan, Utah. This dam, completed in 1965, serves the primary purpose of water supply and is regulated by the Utah Division of Water Rights. Situated on Westwater Creek, this earth-type dam stands at a structural height of 100 feet and has a hydraulic height of 96 feet, providing a storage capacity of 2,779 acre-feet with a normal storage of 2,442 acre-feet.

With a high hazard potential, Blanding City No. 4 has been assessed as satisfactory in condition, last inspected in September 2020. The dam features a spillway width of 6 feet and a length of 2,057 feet, ensuring effective water management in the region. Located in a drainage area that ultimately drains to the Cotto River, this infrastructure plays a vital role in ensuring water availability for the surrounding community, highlighting the importance of its maintenance and regulatory oversight to mitigate potential risks and ensure continued functionality.

Given its critical role in water supply, Blanding City No. 4 serves as a key component in the local water infrastructure network, contributing to the overall water resource management in the region. As climate change impacts continue to affect water availability and quality, the sustainable operation and maintenance of such infrastructure are essential to safeguarding water resources for future generations. By adhering to inspection, enforcement, and emergency preparedness protocols, this dam can continue to fulfill its primary purpose of providing a reliable water supply to the community while effectively managing potential risks and ensuring public safety.

Year Completed	1965
Dam Length	2057
River Or Stream	WESTWATER CREEK
Primary Dam Type	Earth
Hydraulic Height	96
Nid Storage	2779
Structural Height	100
Hazard Potential	High
Foundations	Rock
Nid Height	100

Explore Interactive Map

BLANDING CITY NO. 4

Reservoir Report • Water Levels • Weather Forecast

December 5, 2025

Year_Completed	1965
Dam_Length	2057
River_Or_Stream	WESTWATER CREEK
Primary_Dam_Type	Earth
Hydraulic_Height	96
Nid_Storage	2779
Structural_Height	100
Hazard_Potential	High
Foundations	Rock
Nid_Height	100

Seasonal Comparison

Weather Forecast

Nearby Streamflow Levels

Recapture Creek Near Blanding 0.0cfs	0cfs
South Creek Above Reservoir Near Monticello 0.09cfs	0cfs
Mcelmo Creek Near Colorado-Utah State Line 21.0cfs	21cfs
San Juan River Near Bluff 703.0cfs	703cfs
Dolores River Near Slick Rock 20.0cfs	20cfs
Mcelmo Creek Above Trail Canyon Near Cortez 20.3cfs	20cfs

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.