Connell Wastewater Lagoon 5 Reservoir Report
Last Updated: December 14, 2025
Connell Wastewater Lagoon 5 in Connell, Washington, is a vital water resource managed by the local government for wastewater treatment.
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Summary
Designed by John Wells and completed in 2009, this Earth-type dam stands at a hydraulic height of 12 feet, with a structural height of 9 feet. The lagoon has a storage capacity of 141 acre-feet, serving a drainage area of 0.02 square miles. Its surface area covers 13.1 acres, providing necessary water management for the region.
This wastewater lagoon plays a crucial role in maintaining water quality and ensuring proper treatment of wastewater in the area. With a significant hazard potential but a satisfactory condition assessment as of 2014, regular inspections and maintenance are key to its continued operation. The lagoon's location in the Esquatzel Coulee-TR, near the Walla Walla District, underscores its importance in the local ecosystem and the broader water infrastructure of Washington.
As climate change continues to impact water resources, the Connell Wastewater Lagoon 5 stands as a critical asset for sustainable water management in Franklin County. With state regulation and permitting in place, the lagoon serves as a model for responsible water infrastructure development and maintenance. As water enthusiasts and climate advocates, understanding and supporting the proper management of facilities like Connell Wastewater Lagoon 5 is essential for ensuring the long-term health and sustainability of water resources in the region.
Year Completed |
2009 |
Dam Length |
1285 |
River Or Stream |
Esquatzel Coulee-TR, OS |
Primary Dam Type |
Earth |
Surface Area |
13.1 |
Hydraulic Height |
12 |
Drainage Area |
0.02 |
Nid Storage |
141 |
Structural Height |
9 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Palouse River At Hooper
|
1030cfs |
Tucannon River Near Starbuck
|
174cfs |
Crab Creek Near Moses Lake
|
28cfs |
Yakima River At Kiona
|
23800cfs |
Walla Walla River Near Touchet
|
1040cfs |
Crab Creek At Irby
|
2cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Connell Wastewater Lagoon 5