Mississippi River Lock And Dam 9
Significant HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Wisconsin |
| County | Allamakee |
| Nearest City | PRAIRIE DU CHIEN |
| River/Stream | MISSISSIPPI RIVER |
| Coordinates | 43.21223, -91.10015 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 46 ft |
| Dam Height | 18 ft |
| Dam Length | 9,087 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 470,000 acre-ft |
| Max Storage | 470,000 acre-ft |
| Normal Storage | 197,000 acre-ft |
| Surface Area | 29,125 acres |
| Drainage Area | 66,610 sq mi |
| Max Discharge | 278,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Navigation |
| Owner | USACE - St. Paul District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 09/18/2019 |
| Emergency Action Plan | Yes |