Smithson
Smithson is an earth dam located in Pittsburg County, Oklahoma, built in 1930. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Smithson
Smithson is a dam in Pittsburg, Oklahoma. The dam is owned by Mid-western Aircraft Systems (private). It impounds the Tr-mud Cr near Mcalester.
The dam stands 18 feet tall and stretches 450 feet across, creates a reservoir covering 11 acres, and has a maximum storage capacity of 107 acre-feet. Completed in 1930, the structure is well-established, with more than 75 years of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 11/17/2021.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Oklahoma dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Oklahoma |
| County | Pittsburg |
| Nearest City | Mcalester |
| River/Stream | Tr-mud Cr |
| Coordinates | 34.93950, -95.74027 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 450 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 107 acre-ft |
| Max Storage | 107 acre-ft |
| Normal Storage | 89 acre-ft |
| Surface Area | 11 acres |
| Max Discharge | 7,068 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Other |
| Owner | MID-WESTERN AIRCRAFT SYSTEMS |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/17/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OK21081 |
| Federal ID | OK21081 |
| More Info | State Dam Safety Program |