48Total Dams
39High Hazard
3Significant
Dam Safety in St. Louis County, Missouri
St. Louis County has 48 dams tracked in the National Inventory of Dams. Of these, 39 are classified as high hazard — meaning failure would probably cause loss of human life. Another 3 carry a significant hazard classification. Currently, 1 dam has a condition assessment of poor or unsatisfactory.
The average dam in St. Louis County is 56 years old. The most common purpose is recreation. The tallest dam is Lake Trails Dam at 78 ft.
Explore more: Oldest dams in Missouri · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Dierberg Lake Dam | High | Satisfactory | 68 | Recreation | 1982 |
| Cherry Hill Dam | High | Satisfactory | 68 | Recreation | 1988 |
| Fienup Lake Dam | High | Satisfactory | 62 | Recreation | 1970 |
| Friendship Village of West County Dam | High | Satisfactory | 61 | 1975 | |
| Joe Machs Lake Dam | High | Satisfactory | 56 | 1996 | |
| Chesterfield Village #3 Dam | High | Satisfactory | 52 | ||
| City Place Dam | High | Satisfactory | 51 | Recreation | 1988 |
| Tapawingo Lake Dam | High | Unsatisfactory | 49 | Recreation | |
| Chesterfield Village #2 Dam | High | Satisfactory | 44 | ||
| Lake Post Commons Dam | High | Satisfactory | 44 | Flood Risk Reduction | 1976 |
| Lasiandra Lake Dam | High | Satisfactory | 42 | Recreation | 1994 |
| Woods Mill Cove Dam | High | Satisfactory | 42 | Other | 1988 |
| Wildhorse Creek Parkway Dam | High | Satisfactory | 41 | Flood Risk Reduction | 1989 |
| Fountain Lake Dam | High | Satisfactory | 36 | ||
| City of Fenton Dam #1 | High | Not assessed | 35 | ||
| Village of Green Trails Dam | High | Not assessed | 35 | 2005 | |
| Milner Lake Dam | High | Not assessed | 34 | ||
| Wildhorse Creek Parkway Dam #2 | High | Not assessed | 34 | Recreation | |
| Strumfels Lake Dam | High | Not assessed | 34 | Recreation | 1959 |
| Westgate Lake Dam | High | Not assessed | 33 | Recreation | 1972 |
| Holt's Lake Dam | High | Not assessed | 33 | Recreation | 1973 |
| General American Life Insurance Lk Dm | High | Not assessed | 33 | Flood Risk Reduction | 1976 |
| Hunter Dam | High | Not assessed | 32 | Recreation | 1957 |
| Goessling Dam | High | Not assessed | 32 | Recreation | 1961 |
| Guilford Lake Dam | High | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Lake Chesterfield Dam | High | Not assessed | 30 | Recreation | |
| Raewood Lake Dam | High | Not assessed | 30 | Flood Risk Reduction | 1960 |
| Pheasant Run Lake Dam | High | Not assessed | 30 | Recreation | 1972 |
| Stacy Park Resevoir Dam | High | Not assessed | 30 | Water Supply | 1928 |
| Arrowhead Estates-upper-dam(shallow) | High | Not assessed | 30 | Recreation | 1955 |
| Arrowhead Estates-lower-dam(shallow) | High | Not assessed | 30 | Recreation | 1955 |
| Kehrs Mill Trails Upper Lake Dam | High | Not assessed | 30 | Recreation | 1976 |
| Klein's Lake Dam | High | Not assessed | 25 | Recreation | 1959 |
| Claymont Woods Lake Dam | High | Not assessed | 25 | Recreation | 1970 |
| Kehr's Mill Trail Lower Lake Dam | High | Not assessed | 25 | Recreation | 1976 |
| Mertz Lake Dam | High | Not assessed | 24 | Recreation | 1954 |
| Lake Sherwood | High | Not assessed | 21 | Recreation | 1894 |
| Lake Lasalle Dam | High | Not assessed | 20 | Flood Risk Reduction | 1955 |
| Bee Tree Lake Dam | High | Not assessed | 18 | Recreation | 1972 |
| Lake Trails Dam | Significant | Satisfactory | 78 | Recreation | 1975 |
| Wildhorse Creek Forest Dam | Significant | Satisfactory | 60 | Flood Risk Reduction | 1989 |
| Paradise Valley Dam | Significant | Not assessed | 32 | Recreation | |
| Lone Elk Lower Dam | Low | Satisfactory | 45 | Recreation | 1966 |
| Kehr's Mill Trail East Lake Dam | Low | Not assessed | 34 | Recreation | 1977 |
| Lone Elk-upper Dam | Low | Not assessed | 30 | Recreation | |
| Top Notch Lake Dam | Low | Not assessed | 30 | Recreation | 1971 |
| Wakefield Farm Lake Dam | Low | Not assessed | 30 | Recreation | 1959 |
| City of Fenton Dam #2 | Low | Not assessed | 25 |