Dams in Jefferson County, Colorado
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 Available | 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 Rated | 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 Rated | 62 | Recreation | 1984 |
| D.o.e. Rocky Flats B-5 | Low | Not Available | 57 | Flood Risk Reduction | 1979 |
| Timberline | Low | Fair | 55 | Recreation | |
| D.o.e. Rocky Flats A-4 | Low | Not Available | 54 | Flood Risk Reduction | 1979 |
| Augmentation Pond #6 | Low | Not Rated | 47 | Water Supply | 1989 |
| Hiwan #6 | Low | Satisfactory | 46 | Irrigation | 1963 |
| D.o.e. Rocky Flats C-2 | Low | Not Available | 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 Rated | 37 | Flood Risk Reduction | 1974 |
| Francis Smart | Low | Not Rated | 36 | Irrigation | 1892 |
| Genesee No. 1 | Low | Not Rated | 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 Rated | 28 | Flood Risk Reduction | 1887 |
| Bear Creek No. 4 | Low | Not Rated | 25 | Recreation | 1984 |
| Bergen West Dike | Low | Not Rated | 25 | Irrigation | 1888 |
| Ken Caryl Detention #2 | Low | Satisfactory | 23 | Flood Risk Reduction | 1984 |
| Tepper No. 1 | Low | Not Rated | 22 | Recreation | 1912 |
| Kenney's Run Detention #2 | Low | Not Rated | 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 Rated | 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 Rated | 12 | Irrigation | 1966 |
| Mower | Low | Not Rated | 11 | Fish and Wildlife Pond | 1885 |
| Baehr | Low | Fair | 11 | Irrigation | 1948 |
| Marston Lake - West Dike | Low | Not Rated | 11 | Water Supply | 1899 |
| Churches | Low | Not Rated | 9 | Irrigation | 1868 |
| Crown Hill Cemetery | Low | Not Rated | 9 | Irrigation | 1908 |
| Pomona Lake No. 1 | Low | Not Rated | 9 | Flood Risk Reduction | 1902 |