Roslyn Wastewater Lagoon No 3 Reservoir Report

Reservoir Report

Washington

Nearby: Cle Elum Dike 2 Cle Elum Dike 3

Last Updated: December 15, 2025

Roslyn Wastewater Lagoon No 3, located in Cle Elum, Washington, was completed in 1973 and serves as an essential piece of infrastructure for the local government.

°F

mph

Wind

%

Humidity

Summary

With a storage capacity of 59 acre-feet and a surface area of 5.3 acres, this Earth-type dam plays a crucial role in managing wastewater and protecting the surrounding environment. The lagoon is regulated by the Washington Department of Ecology and undergoes regular inspections to ensure its safety and functionality.

Despite being classified as having a low hazard potential, Roslyn Wastewater Lagoon No 3 is subject to state jurisdiction and enforcement, indicating the importance of maintaining its structural integrity. The dam's hydraulic height of 10 feet allows for efficient water management, with a maximum discharge rate of 1 cubic foot per second. Its location near Crystal Creek-Offstream contributes to the overall environmental impact of the facility, highlighting the intersection of water resource management and climate considerations in the region.

As water resource and climate enthusiasts explore the intricacies of Roslyn Wastewater Lagoon No 3, they can appreciate the careful design and construction that went into creating this essential infrastructure. With a primary purpose of "Other" and a normal storage capacity of 50 acre-feet, this lagoon serves as a vital component of the local water management system. By understanding its role in the broader context of environmental protection and resource utilization, enthusiasts can gain a deeper appreciation for the complex interplay between human infrastructure and natural ecosystems in Kittitas County, Washington.

Year Completed	1973
Dam Length	2000
River Or Stream	Crystal Creek-Offstream
Primary Dam Type	Earth
Surface Area	5.3
Hydraulic Height	10
Drainage Area	10
Nid Storage	59
Structural Height	10
Hazard Potential	Low
Foundations	Soil
Nid Height	10

Explore Interactive Map

ROSLYN WASTEWATER LAGOON NO 3

Reservoir Report • Water Levels • Weather Forecast

December 15, 2025

Year_Completed	1973
Dam_Length	2000
River_Or_Stream	Crystal Creek-Offstream
Primary_Dam_Type	Earth
Surface_Area	5.3
Hydraulic_Height	10
Drainage_Area	10
Nid_Storage	59
Structural_Height	10
Hazard_Potential	Low
Foundations	Soil
Nid_Height	10

Seasonal Comparison

Weather Forecast

Nearby Streamflow Levels

American River Near Nile 809.0cfs	809cfs
Icicle Creek Above Snow Creek Near Leavenworth 2190.0cfs	2190cfs
Cedar River Below Bear Creek Near Cedar Falls 562.0cfs	562cfs
Wenatchee River At Peshastin 15200.0cfs	15200cfs
Greenwater River At Greenwater 905.0cfs	905cfs
Wenatchee River At Monitor 16400.0cfs	16400cfs

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.