Dams in Walla Walla County, Washington
13Total Dams
6High Hazard
5Significant
Dam Safety in Walla Walla County, Washington
Walla Walla County has 13 dams tracked in the National Inventory of Dams. Of these, 6 are classified as high hazard — meaning failure would probably cause loss of human life. Another 5 carry a significant hazard classification.
The average dam in Walla Walla County is 42 years old. The most common purpose is other. The tallest dam is Ice Harbor Lock And Dam at 208 ft.
Explore more: Oldest dams in Washington · Tallest dams · High risk dams · Largest reservoirs
Data note: Hazard potential describes the consequences if a dam failed; it does not predict the likelihood of failure. Inspection, condition, and emergency-plan fields can be incomplete or delayed. Check state dam-safety officials and local emergency managers for official guidance.
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Ice Harbor Lock And Dam | High | Not Available | 208 | Navigation | 1962 |
| Mill Creek Storage Dam | High | Not Available | 145 | Flood Risk Reduction | 1942 |
| Tyson Fresh Meats Storage Pond 4 | High | Satisfactory | 52 | Other | 1993 |
| Mountain Pond Dam | High | Fair | 42 | Irrigation | 1992 |
| Orchards Block 96 Reservoir Dam | High | Satisfactory | 32 | Irrigation | 2001 |
| Flat Top Ranch Frost Control Pond | High | Fair | 18 | Irrigation | 1996 |
| Tyson Fresh Meats Pasco Brine Pond 8 | Significant | Satisfactory | 17 | Other | 2010 |
| Simplot Feeders Waste Pond No1 | Significant | Fair | 15 | Other | 1973 |
| Mill Creek Storage Dam - Diversion Dam | Significant | Not Available | 14 | Flood Risk Reduction | 1942 |
| Tyson Fresh Meats Brine Pond 7 | Significant | Satisfactory | 9 | Other | 1995 |
| Tyson Fresh Meats Lagoons 1 2 3 | Significant | Satisfactory | 8 | Other | 1980 |
| Orchards Block 92 Dam | Low | 22 | Irrigation | 1992 | |
| Walla Walla Effluent Storage Lagoon | Low | Satisfactory | 19 | Other | 2008 |