Connell Wastewater Lagoon 1a Reservoir Report
Last Updated: December 15, 2025
Connell Wastewater Lagoon 1a, located in Connell, Washington, is a vital water resource managed by the local government.
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Summary
Designed by John Wells and completed in 2009, this Earth-type dam serves a primary purpose of wastewater management, with a hydraulic height of 22 feet and a length of 800 feet. The lagoon has a storage capacity of 17 acre-feet, with a normal storage level of 13.27 acre-feet.
This significant structure is regulated by the Washington Dept of Ecology, with state jurisdiction and enforcement in place to ensure its proper operation. Despite its satisfactory condition assessment as of 2014, the lagoon is classified as having a significant hazard potential. The dam's last inspection in 2014 revealed a satisfactory condition, and it is subject to regular inspections every five years to ensure its continued safety and functionality.
Connell Wastewater Lagoon 1a plays a crucial role in managing wastewater in Franklin County, Washington, contributing to the protection of the environment and public health in the region. As water resource and climate enthusiasts, understanding the infrastructure and operation of such facilities is essential to promoting sustainable water management practices and ensuring the resilience of our water resources in the face of changing climate conditions.
Year Completed |
2009 |
Dam Length |
800 |
River Or Stream |
Esquatzel Coulee-TR, OS |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
22 |
Nid Storage |
17 |
Structural Height |
22 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
22 |
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 |
Crab Creek At Irby
|
2cfs |
Walla Walla River Near Touchet
|
1040cfs |
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 1a