50Total Dams
36High Hazard
10Significant
Dam Safety in Yakima County, Washington
Yakima County has 50 dams tracked in the National Inventory of Dams. Of these, 36 are classified as high hazard — meaning failure would probably cause loss of human life. Another 10 carry a significant hazard classification. Currently, 7 dams have a condition assessment of poor or unsatisfactory.
The average dam in Yakima County is 37 years old. The most common purpose is irrigation. The tallest dam is Tieton Dam at 319 ft.
Explore more: Oldest dams in Washington · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Tieton Dam | High | Not assessed | 319 | Flood Risk Reduction | 1925 |
| Wenas Dam | High | Fair | 90 | Irrigation | 1911 |
| Clear Creek Dam | High | Not assessed | 84 | Fish and Wildlife Pond | 1914 |
| Roza Ww5 Reregulation Reservoir | High | Satisfactory | 76 | Irrigation | 2017 |
| French Canyon Dam | High | Not assessed | 74 | Irrigation | 1985 |
| Bumping Lake Dam | High | Not assessed | 61 | Flood Risk Reduction | 1910 |
| Evans Flavorland Reservoir No 1 | High | Satisfactory | 50 | Irrigation | 1985 |
| Sunnyside Mp 23.7 Reservoir | High | Satisfactory | 43 | Irrigation | 2008 |
| Evans Flavorland Reservoir No 2 | High | Satisfactory | 40 | Irrigation | 1998 |
| Moxee Valley Orchards Dam | High | Poor | 39 | Irrigation | 1985 |
| Parker Reservoir Dam | High | Poor | 36 | Irrigation | 1955 |
| Evans Tieton Pond Dam | High | Satisfactory | 35 | Irrigation | 2004 |
| Farmland Ranch 19 Dam | High | Satisfactory | 35 | Irrigation | 1992 |
| Sunnyside Mp 37.1 Reservoir | High | Fair | 34 | Irrigation | 2011 |
| Evans Konnowac Dam | High | Poor | 33 | Irrigation | 1990 |
| Cow Palace Lagoon 2 | High | Satisfactory | 28 | Other | 2017 |
| George Deruyter & Son Dairy Lagoon 2 | High | Not assessed | 24 | Other | 2022 |
| Roche Pomona Dam | High | Satisfactory | 23 | Irrigation | 1995 |
| Port of Sunnyside Anaerobic Pretreatment System | High | Satisfactory | 22 | Other | 2015 |
| Selah Home Ranch Reservoir | High | Satisfactory | 22 | Irrigation | 2009 |
| George Deruyter & Son Dairy Lagoon 3 | High | Not assessed | 22 | Other | 2022 |
| Chiawana Gleed Ranch Dam | High | Fair | 21 | Irrigation | 2003 |
| Olympic Orchards Dam 2 | High | Fair | 21 | Irrigation | 1985 |
| Olympic Orchards Dam 1 | High | Poor | 21 | Irrigation | 1985 |
| Selah Naches Ranch Reservoir | High | Satisfactory | 20 | Irrigation | 2004 |
| Evans Far West Pond Dam | High | Poor | 18 | Irrigation | 1997 |
| Stevenson Dam | High | Poor | 17 | Recreation | 1969 |
| Olympic Orchards Dam 3 | High | Fair | 17 | Irrigation | 1985 |
| Olympic Orchards Dam 5 | High | Satisfactory | 17 | Irrigation | 1985 |
| Del Monte Foods Inc | High | Satisfactory | 12 | Other | 1968 |
| Den Hoed Dam No 1 | High | Poor | 12 | Irrigation | 1999 |
| Olympic Orchards Dam 4 | High | Fair | 12 | Irrigation | 1985 |
| Gamache Dam | High | Fair | 11 | Irrigation | 1987 |
| Selah Aerated Lagoon | High | Fair | 11 | Other | 1985 |
| Svid Mabton Canal 12.48 Reservoir | High | Satisfactory | 9 | Irrigation | 2010 |
| Friesland Dairy Lagoons | High | Fair | 6 | Other | 2013 |
| Cow Palace Lagoon 1 | Significant | Fair | 23 | Other | 2000 |
| Sunny Dene Dairy Waste Pond | Significant | Fair | 21 | Other | 2004 |
| The Vineyards Water Storage Pond | Significant | Not assessed | 16 | Irrigation | |
| Grandview Wastewater Aqua Lagoon Dam | Significant | Fair | 10 | Other | 1999 |
| Bosma Old Pond 1 | Significant | Fair | 9 | Other | 2000 |
| Grandview Wastewater E&f Lagoons Dam | Significant | Fair | 9 | Other | 1997 |
| Grandview Wastewater A-cell Lagoon Dam | Significant | Fair | 7 | Other | 1991 |
| Liberty Acres Lagoon 3 | Significant | Fair | 7 | Other | 1990 |
| D&j Dairy Consolidated Lagoon No. 1 | Significant | Not assessed | 6 | Other | 2021 |
| Liberty Acres Lagoon 7 | Significant | Fair | 6 | Other | 2000 |
| Van Wingerden Pond 1 | Low | Fair | 18 | Irrigation | 1980 |
| Sunnyside Indust Wastewater Lag 1 2 & 3 | Low | Not assessed | 17 | Other | 1992 |
| Tree Top Selah Wastewater Lagoon | Low | Not assessed | 15 | Other | 1991 |
| Byron Ponds Dam | Low | Not assessed | 10 | Recreation | 1950 |