Dresser Minerals No 7 Dam (dry) is a rockfill dam located in Washington County, Missouri, built in 1972. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall, taller than 68% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic rockfill embankment section and the water level is illustrative.
About Dresser Minerals No 7 Dam (dry)
The primary purpose of Dresser Minerals No 7 Dam (dry) is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by Mi Drilling Fluids Compa (private). It impounds the Tr-mill Creek near Blackwell.
The dam stands 30 feet tall, creates a reservoir covering 31 acres, has a maximum storage capacity of 650 acre-feet, and collects water from a drainage area of 31 square miles. Completed in 1972, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Missouri |
| County | Washington |
| Nearest City | Blackwell |
| River/Stream | Tr-mill Creek |
| Coordinates | 37.97772, -90.70156 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 650 acre-ft |
| Max Storage | 650 acre-ft |
| Normal Storage | 650 acre-ft |
| Surface Area | 31 acres |
| Drainage Area | 31 sq mi |
Ownership & Safety
| Purpose | Tailings |
| Owner | Mi Drilling Fluids Compa |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO30124 |
| Federal ID | MO30124 |
| More Info | State Dam Safety Program |