52Total Dams
44High Hazard
2Significant
Dam Safety in Maricopa County, Arizona
Maricopa County has 52 dams tracked in the National Inventory of Dams. Of these, 44 are classified as high hazard — meaning failure would probably cause loss of human life. Another 2 carry a significant hazard classification. Currently, 1 dam has a condition assessment of poor or unsatisfactory.
The average dam in Maricopa County is 57 years old. The most common purpose is flood risk reduction. The tallest dam is New Waddell Dam at 440 ft.
Explore more: Oldest dams in Arizona · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| New Waddell Dam | High | Not assessed | 440 | Flood Risk Reduction | 1992 |
| Theodore Roosevelt Dam | High | Not assessed | 357 | Hydroelectric | 1911 |
| Bartlett Dam | High | Not assessed | 309 | Water Supply | 1939 |
| Horse Mesa Dam | High | Not assessed | 305 | Hydroelectric | 1927 |
| Mormon Flat Dam | High | Not assessed | 224 | Hydroelectric | 1926 |
| Stewart Mountain Dam | High | Not assessed | 210 | Hydroelectric | 1930 |
| Horseshoe Dam | High | Not assessed | 202 | Irrigation | 1946 |
| Painted Rock Dam - Saddle Dike 1 | High | Not assessed | 181 | Flood Risk Reduction | 1960 |
| Cave Buttes | High | Satisfactory | 118 | Flood Risk Reduction | 1980 |
| Adobe | High | Satisfactory | 89 | Flood Risk Reduction | 1982 |
| North Heights (no. 11) | High | Satisfactory | 59 | Flood Risk Reduction | 1976 |
| Sunridge Canyon (no. 7) | High | Satisfactory | 56 | Flood Risk Reduction | 1972 |
| White Tanks #3 | High | Satisfactory | 55 | Flood Risk Reduction | 1956 |
| Sunnycove | High | Satisfactory | 51 | Flood Risk Reduction | 1975 |
| Hesperus Wash (no. 36) | High | Satisfactory | 49 | Flood Risk Reduction | 1973 |
| Harquahala Frs | High | Satisfactory | 49 | Flood Risk Reduction | 1982 |
| Buckeye Frs #1 | High | Poor | 49 | Flood Risk Reduction | 1974 |
| Casandro Wash | High | Satisfactory | 47 | Flood Risk Reduction | 1996 |
| Palo Verde Evaporation Pond No. 3 | High | Satisfactory | 45 | Other | 2009 |
| Signal Butte Frs | High | Satisfactory | 45 | Flood Risk Reduction | 1988 |
| Thunderbird Park Reservoir | High | Satisfactory | 44 | Water Supply | 1985 |
| Dreamy Draw | High | Satisfactory | 42 | Flood Risk Reduction | 1973 |
| Aspen (no. 6) | High | Satisfactory | 42 | Flood Risk Reduction | 1973 |
| Palo Verde Evaporation Pond #2 | High | Satisfactory | 39 | Other | 1987 |
| Fountain Lake | High | Satisfactory | 38 | Other | 1970 |
| Stoneridge (no. 19) | High | Satisfactory | 38 | Flood Risk Reduction | 1973 |
| West Park | High | Satisfactory | 38 | Flood Risk Reduction | 1974 |
| Guadalupe | High | Satisfactory | 37 | Flood Risk Reduction | 1975 |
| Golden Eagle Park (no. 4) | High | Satisfactory | 37 | Flood Risk Reduction | 1973 |
| New River Dam - Dike No. 1 | High | Not assessed | 36 | Flood Risk Reduction | 1986 |
| Mcmicken | High | Fair | 35 | Flood Risk Reduction | 1956 |
| Reach 11 Detention Dike 1 | High | Not assessed | 35 | 1977 | |
| Palo Verde Evaporation Pond #1 | High | Satisfactory | 34 | Other | 1981 |
| Buckeye Frs #3 | High | Satisfactory | 34 | Flood Risk Reduction | 1975 |
| East Park | High | Satisfactory | 33 | Flood Risk Reduction | 1974 |
| Sunset | High | Satisfactory | 32 | Flood Risk Reduction | 1977 |
| North Mountain Flood Detention #3 | High | Satisfactory | 32 | Flood Risk Reduction | 1975 |
| Saddleback Frs | High | Fair | 31 | Flood Risk Reduction | 1982 |
| Phoenix Detention Basin #7 | High | Satisfactory | 31 | Flood Risk Reduction | 1978 |
| White Tanks #4 | High | Satisfactory | 30 | Flood Risk Reduction | 1956 |
| Spook Hill | High | Satisfactory | 27 | Flood Risk Reduction | 1979 |
| Buckeye Frs #2 | High | Satisfactory | 26 | Flood Risk Reduction | 1975 |
| Plains Lpg Dam | High | Satisfactory | 23 | Other | 1977 |
| Red Mountain Freeway Levee | High | Satisfactory | 16 | Flood Risk Reduction | 2008 |
| Gillespie | Significant | Fair | 66 | Irrigation | 1921 |
| Rio Salado Town Lake | Significant | Satisfactory | 40 | Recreation | 1997 |
| Cave Creek | Low | Not assessed | 120 | Flood Risk Reduction | 1923 |
| Camp Dyer Diversion | Low | Not assessed | 81 | Irrigation | 1926 |
| Granite Reef Diversion Dam | Low | Not assessed | 29 | Irrigation | 1908 |
| Mesquite Generating Station Evaporation Ponds | Low | Not assessed | 19 | Other | 2003 |
| Cortez Tank | Low | Not assessed | 15 | Fire Protection, Stock, Or Small Fish Pond | |
| Gila Bend Wwtp | Low | Not assessed | 12 | Other | 1995 |