103Total Dams
32High Hazard
19Significant
Dam Safety in Boulder County, Colorado
Boulder County has 103 dams tracked in the National Inventory of Dams. Of these, 32 are classified as high hazard — meaning failure would probably cause loss of human life. Another 19 carry a significant hazard classification. Currently, 1 dam has a condition assessment of poor or unsatisfactory.
The average dam in Boulder County is 106 years old. The most common purpose is irrigation. The tallest dam is Gross at 350 ft.
Explore more: Oldest dams in Colorado · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Gross | High | Fair | 350 | Hydroelectric | 1955 |
| Button Rock | High | Satisfactory | 214 | Water Supply | 1969 |
| Barker Meadow | High | Satisfactory | 184 | Hydroelectric | 1909 |
| Marshall Lake | High | Satisfactory | 101 | Irrigation | 1908 |
| Pine Brook | High | Satisfactory | 84 | Water Supply | 2006 |
| Superior | High | Satisfactory | 83 | Water Supply | 1994 |
| Valmont 'a' | High | Fair | 80 | Water Supply | 1962 |
| Silver Lake | High | Fair | 70 | Water Supply | 1887 |
| Left Hand Valley | High | Satisfactory | 68 | Irrigation | 1952 |
| Left Hand Park | High | Satisfactory | 65 | Irrigation | 1966 |
| Boulder - South | High | Satisfactory | 59 | Water Supply | 1955 |
| Foothills | High | Satisfactory | 56 | Irrigation | 1911 |
| Six Mile - Main | High | Satisfactory | 52 | Irrigation | 1892 |
| Boulder - North | High | Satisfactory | 51 | Water Supply | 1955 |
| Baseline - East | High | Satisfactory | 44 | Irrigation | 1905 |
| Clover Basin | High | Satisfactory | 39 | Irrigation | 1910 |
| Lagerman | High | Satisfactory | 36 | Fish and Wildlife Pond | 1878 |
| Beaver Park | High | Satisfactory | 33 | Irrigation | 1892 |
| Waneka | High | Satisfactory | 31 | Recreation | 1865 |
| Leggett & Hillcrest | High | Satisfactory | 28 | Water Supply | 1917 |
| Hayden | High | Fair | 27 | Irrigation | 1905 |
| Glacier Lake | High | Fair | 25 | Irrigation | 1905 |
| Mesa Park | High | Fair | 25 | Recreation | 1907 |
| Kossler | High | Satisfactory | 20 | Hydroelectric | 1909 |
| Baseline - Northwest | High | Satisfactory | 20 | Irrigation | 1905 |
| Longmont Wtp Forebay Embankment | High | Satisfactory | 20 | Water Supply | 2005 |
| Erie | High | Fair | 19 | Water Supply | 1935 |
| Pleasant Valley | High | Satisfactory | 19 | Irrigation | 1868 |
| Jasper | High | Satisfactory | 18 | Water Supply | 1988 |
| Mccall | High | Satisfactory | 14 | Water Supply | 1909 |
| Davis No. 1 | High | Satisfactory | 13 | Irrigation | 1910 |
| Harper Lake | High | Satisfactory | 11 | Water Supply | 1985 |
| Panama No. 1 - East | Significant | Satisfactory | 51 | Irrigation | 1904 |
| Margaret Spurgeon #1 | Significant | Satisfactory | 42 | Irrigation | 1963 |
| Highland #2 (south) | Significant | Satisfactory | 41 | Irrigation | 1881 |
| Highland #2 (north) | Significant | Satisfactory | 41 | Irrigation | 1881 |
| Albion Lake | Significant | Fair | 36 | Water Supply | 1913 |
| Oligarchy #1 | Significant | Satisfactory | 33 | Irrigation | 1889 |
| Goose Lake | Significant | Satisfactory | 32 | Water Supply | 1908 |
| Gold Lake #1 | Significant | Satisfactory | 24 | Fish and Wildlife Pond | 1879 |
| Allen Lake | Significant | Satisfactory | 24 | Irrigation | 1928 |
| Louisville No. 1 | Significant | Satisfactory | 20 | Water Supply | 1888 |
| Gold Lake #2 | Significant | Satisfactory | 19 | Fish and Wildlife Pond | 1879 |
| Mcintosh | Significant | Satisfactory | 17 | Irrigation | 1902 |
| Brainard Lake | Significant | Not assessed | 17 | Recreation | 1943 |
| Panama No. 1 - South | Significant | Satisfactory | 16 | Irrigation | 1904 |
| Prince No. 1 | Significant | Satisfactory | 14 | Irrigation | 1893 |
| Ish #3 (east Dam) | Significant | Satisfactory | 12 | Irrigation | |
| Gaynor | Significant | Satisfactory | 10 | Irrigation | |
| Los Lagos No. 3 | Significant | Satisfactory | 10 | Irrigation | 1894 |
| Gold Lake #3 | Significant | Satisfactory | 9 | Fish and Wildlife Pond | 1879 |
| Green Lake No. 2 | Low | Not assessed | 52 | Water Supply | 1938 |
| Longs Peak #2 | Low | Not assessed | 51 | Fish and Wildlife Pond | 1968 |
| Joder | Low | Satisfactory | 46 | Irrigation | 1962 |
| Loukonen Brothers | Low | Not assessed | 45 | Irrigation | 1961 |
| South Boulder Diversion Intake Dam | Low | Fair | 43 | Water Supply | 1936 |
| St. Joe Tailings | Low | Not assessed | 42 | Tailings | 1936 |
| Longs Peak #1 | Low | Satisfactory | 41 | Fish and Wildlife Pond | 1960 |
| Lake Isabelle | Low | Fair | 38 | Irrigation | 1925 |
| Western Mobile Lake 4 | Low | Not assessed | 33 | ||
| Longmont Reservoir | Low | Unsatisfactory | 30 | Water Supply | 1900 |
| Green Lake No. 3 | Low | Satisfactory | 28 | Water Supply | 1907 |
| Slinde | Low | Not assessed | 25 | Irrigation | 1950 |
| Skyscraper | Low | Fair | 24 | Water Supply | 1940 |
| Green Lake No. 1 | Low | Not assessed | 24 | Water Supply | 1940 |
| Copeland | Low | Fair | 24 | Water Supply | 1934 |
| Viele Lake | Low | Fair | 24 | Recreation | 1967 |
| Island Lake | Low | Fair | 23 | Water Supply | 1890 |
| Hodgson-harris | Low | Satisfactory | 23 | Fish and Wildlife Pond | 1906 |
| Mesa | Low | Fair | 22 | Recreation | 1907 |
| Lakewood Reservoir | Low | Not assessed | 22 | Water Supply | 1906 |
| Tumblesom | Low | Fair | 19 | Fish and Wildlife Pond | 1918 |
| Goodhue No. 1 | Low | Fair | 18 | Irrigation | 1938 |
| Silver Spruce #2 | Low | Satisfactory | 18 | Recreation | 1958 |
| Mccaslin | Low | Satisfactory | 16 | Irrigation | 1908 |
| Branith #1 | Low | Satisfactory | 16 | Irrigation | |
| Swede | Low | Satisfactory | 15 | Irrigation | 1930 |
| Sunset Lake | Low | Fair | 15 | Irrigation | |
| Wwtp | Low | Not assessed | 14 | ||
| Prince No. 1 | Low | Satisfactory | 14 | Water Supply | 1879 |
| Six Mile - Northwest | Low | Fair | 14 | Irrigation | 1892 |
| Golden Pond No. 3 | Low | Satisfactory | 13 | ||
| Left Hand | Low | Satisfactory | 13 | Irrigation | 1900 |
| Steele Brothers #2 | Low | Not assessed | 13 | Irrigation | 1900 |
| Marfell Lake No. 1 | Low | Not assessed | 12 | Irrigation | 1880 |
| Independent | Low | Satisfactory | 12 | Irrigation | 1903 |
| Hecla | Low | Fair | 12 | Irrigation | 1915 |
| Dodd | Low | Satisfactory | 12 | Irrigation | 1875 |
| Teller No. 2 | Low | Fair | 12 | Irrigation | 1904 |
| Steele Brothers #1 | Low | Satisfactory | 12 | Irrigation | 1918 |
| Peterson Lake | Low | Fair | 12 | Water Supply | 1961 |
| Panama No. 1 - Northeast | Low | Satisfactory | 12 | Irrigation | 1904 |
| Teller Lake No. 5 - East | Low | Not assessed | 12 | Irrigation | 1911 |
| Crystal | Low | Not assessed | 11 | Recreation | 1881 |
| Davis No. 2 | Low | Satisfactory | 11 | Irrigation | 1948 |
| West Lake | Low | Not assessed | 10 | Irrigation | 2020 |
| Beaver Park East | Low | Not assessed | 10 | Fish and Wildlife Pond | 1892 |
| Davis | Low | Not assessed | 9 | Irrigation | 1886 |
| Teller Lake No. 5 - West | Low | Not assessed | 9 | Irrigation | 1911 |
| Walker | Low | Satisfactory | 8 | Irrigation | 1892 |
| Divide | Low | Not assessed | 8 | Irrigation | 1879 |
| Calkins | Low | Not assessed | 8 | Irrigation | 1879 |
| Panama No. 1 - Northwest | Low | Not assessed | 7 | Irrigation | 1904 |