86Total Dams
29High Hazard
11Significant
Dam Safety in Jefferson County, Colorado
Jefferson County has 86 dams tracked in the National Inventory of Dams. Of these, 29 are classified as high hazard — meaning failure would probably cause loss of human life. Another 11 carry a significant hazard classification. Currently, 6 dams have a condition assessment of poor or unsatisfactory.
The average dam in Jefferson County is 81 years old. The most common purpose is irrigation. The tallest dam is Cheesman at 221 ft.
Explore more: Oldest dams in Colorado · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Cheesman | High | Satisfactory | 221 | Water Supply | 1905 |
| Ralston | High | Satisfactory | 204 | Water Supply | 1937 |
| Fortune | High | Satisfactory | 134 | Water Supply | 2001 |
| Blunn | High | Satisfactory | 125 | Water Supply | 1979 |
| Standley Lake | High | Satisfactory | 123 | Irrigation | 1913 |
| Genesee No. 2 | High | Satisfactory | 103 | Water Supply | 2008 |
| Wellington | High | Fair | 84 | Irrigation | 1895 |
| Bear Creek Dam - South Embankment | High | Not assessed | 65 | Flood Risk Reduction | 1979 |
| Lookout Mountain | High | Satisfactory | 60 | Water Supply | 1903 |
| Maple Grove | High | Satisfactory | 59 | Water Supply | 1956 |
| Magic Mountain #1 | High | Not assessed | 56 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Evergreen | High | Fair | 50 | Water Supply | 1927 |
| Woman Creek | High | Satisfactory | 50 | Flood Risk Reduction | 1995 |
| Leyden | High | Satisfactory | 47 | Flood Risk Reduction | 1902 |
| Main | High | Satisfactory | 46 | Irrigation | 1908 |
| Upper Long Lake | High | Unsatisfactory | 46 | Water Supply | 1939 |
| Fairmount Reservoir | High | Satisfactory | 43 | Water Supply | 1993 |
| Smith | High | Unsatisfactory | 40 | Irrigation | 1908 |
| Morrison Raw Water | High | Satisfactory | 40 | Water Supply | 1982 |
| Bergen East | High | Satisfactory | 40 | Irrigation | 1874 |
| Harriman | High | Satisfactory | 38 | Irrigation | 2013 |
| Willow Springs #1 | High | Fair | 31 | Water Supply | 1963 |
| Ketner | High | Satisfactory | 30 | Recreation | 1961 |
| Tucker Lake - North Dam | High | Satisfactory | 29 | Irrigation | 1906 |
| Tucker Lake - South Dam | High | Satisfactory | 29 | Irrigation | 1899 |
| Polly A. Deane | High | Unsatisfactory | 28 | Irrigation | 1908 |
| Hyatt | High | Unsatisfactory | 24 | Irrigation | 1863 |
| East | High | Satisfactory | 21 | Irrigation | 1910 |
| Lower Long Lake | High | Unsatisfactory | 19 | Water Supply | 1939 |
| Harwood's Storage Reservoir | Significant | Satisfactory | 36 | Recreation | 1955 |
| Pomona No. 2 and No. 3 | Significant | Satisfactory | 34 | Recreation | 1972 |
| Meadowview | Significant | Satisfactory | 30 | Water Supply | 2004 |
| Beers Sisters Lake | Significant | Satisfactory | 27 | Irrigation | 1966 |
| Bowles #1 | Significant | Satisfactory | 25 | Irrigation | 1973 |
| Bergen West | Significant | Fair | 25 | Irrigation | 1888 |
| Kendrick | Significant | Satisfactory | 22 | Irrigation | 1922 |
| Lockport | Significant | Fair | 20 | Water Supply | 1984 |
| Devinney | Significant | Satisfactory | 19 | Irrigation | 2006 |
| Johnston | Significant | Satisfactory | 17 | Irrigation | 1974 |
| Carmody | Significant | Satisfactory | 8 | Recreation | 1974 |
| Quaintance | Low | Not assessed | 62 | Recreation | 1984 |
| D.o.e. Rocky Flats B-5 | Low | Not assessed | 57 | Flood Risk Reduction | 1979 |
| Timberline | Low | Fair | 55 | Recreation | |
| D.o.e. Rocky Flats A-4 | Low | Not assessed | 54 | Flood Risk Reduction | 1979 |
| Augmentation Pond #6 | Low | Not assessed | 47 | Water Supply | 1989 |
| Hiwan #6 | Low | Satisfactory | 46 | Irrigation | 1963 |
| D.o.e. Rocky Flats C-2 | Low | Not assessed | 45 | Other | 1979 |
| Duke Lake | Low | Satisfactory | 41 | Water Supply | 1972 |
| Hiwan #4 | Low | Fair | 37 | Recreation | 1963 |
| Rolling | Low | Fair | 37 | Irrigation | 1966 |
| 6th Avenue W. Pond #3 | Low | Not assessed | 37 | Flood Risk Reduction | 1974 |
| Francis Smart | Low | Not assessed | 36 | Irrigation | 1892 |
| Genesee No. 1 | Low | Not assessed | 34 | Other | 1975 |
| Gayno | Low | Satisfactory | 33 | Water Supply | 1977 |
| Platte Canyon | Low | Fair | 32 | Water Supply | 1904 |
| Maxwell Creek | Low | Fair | 31 | Water Supply | 1982 |
| Platte Canyon Intake | Low | Unsatisfactory | 31 | Water Supply | 1964 |
| West Jefferson | Low | Fair | 30 | Water Supply | 1982 |
| Soda Lake #1 | Low | Fair | 30 | Water Supply | 1977 |
| Mcintyre Gulch | Low | Satisfactory | 28 | 1982 | |
| Oberon Lake No. 1 | Low | Not assessed | 28 | Flood Risk Reduction | 1887 |
| Bear Creek No. 4 | Low | Not assessed | 25 | Recreation | 1984 |
| Bergen West Dike | Low | Not assessed | 25 | Irrigation | 1888 |
| Ken Caryl Detention #2 | Low | Satisfactory | 23 | Flood Risk Reduction | 1984 |
| Tepper No. 1 | Low | Not assessed | 22 | Recreation | 1912 |
| Kenney's Run Detention #2 | Low | Not assessed | 22 | Irrigation | 2002 |
| Bergen #5 | Low | Fair | 21 | Fire Protection, Stock, Or Small Fish Pond | 1908 |
| Grant B | Low | Fair | 19 | Irrigation | 1910 |
| West Meadows #2 | Low | Fair | 17 | Recreation | 1983 |
| West Meadows #1 | Low | Fair | 17 | Recreation | 1983 |
| Union #2 | Low | Fair | 17 | Recreation | 1982 |
| Mann | Low | Satisfactory | 15 | Recreation | 1877 |
| Soda Lake #2 | Low | Fair | 15 | Water Supply | 1977 |
| Last Chance No. 1 | Low | Fair | 14 | Irrigation | 1892 |
| Ward #1 | Low | Not assessed | 13 | Irrigation | 1888 |
| Fairview #2 | Low | Satisfactory | 13 | Irrigation | 1892 |
| Broad | Low | Satisfactory | 13 | Irrigation | 1870 |
| Henry's Lake | Low | Satisfactory | 12 | Recreation | 1972 |
| Fairview # 1 | Low | Satisfactory | 12 | Irrigation | 1871 |
| Upper Mount Olivet | Low | Not assessed | 12 | Irrigation | 1966 |
| Mower | Low | Not assessed | 11 | Fish and Wildlife Pond | 1885 |
| Baehr | Low | Fair | 11 | Irrigation | 1948 |
| Marston Lake - West Dike | Low | Not assessed | 11 | Water Supply | 1899 |
| Churches | Low | Not assessed | 9 | Irrigation | 1868 |
| Crown Hill Cemetery | Low | Not assessed | 9 | Irrigation | 1908 |
| Pomona Lake No. 1 | Low | Not assessed | 9 | Flood Risk Reduction | 1902 |