Lock and Dam No. 7
From Wikipedia, the free encyclopedia
| Lock and Dam No. 7 | |
 Mississippi River Lock and Dam number 7 |
|
| Impounds | Upper Mississippi River |
|---|---|
| Creates | Pool 7 |
| Locale | La Crescent, Minnesota |
| Maintained by | United States Army Corps of Engineers |
| Length | 940 feet (286.5 m) (movable portion) |
| Construction began | 1933 |
| Opening date | April 1937 |
| Geographical Data | |
| Coordinates | |
Lock and Dam No. 7 is a lock and dam located near Onalaska, Wisconsin on the Upper Mississippi River. It forms pool 7 and Lake Onalaska.
The facility is located on Mississippi River mile 702.5 near La Crescent, Minnesota. It was constructed and placed in operation in April, 1937 and underwent major rehabilitation from 1989 through 2002.
The dam consists of concrete structure 940 feet (286.5 m) long, five roller gates and 11 tainter gates. Two segments of earth embankment 8,100 feet (2,468.9 m) long from dam to French Island. One concrete spillway 1,000 feet (304.8 m) long. And 2,400 feet (731.5 m) long from French Island, Wisconsin to Onalaska, Wisconsin. The concrete spillway is 670 feet (204.2 m) long and the lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long.[1]
[edit] See also
- I-90 Mississippi River Bridge, just downstream.
[edit] Notes
[edit] External links
- USGS Reach 1 pool 7
- USACE - Lock and Dam 7
- Survey number HAER MN-24 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 7, Dresbach vicinity, Winona County, MN
- Lock and Dam No. 7 is at coordinates Coordinates:
| Locks and dams of the Upper Mississippi River | |
|---|---|
| USAF • LSAF • 1 • 2 • 3 • 4 • 5 • 5A • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 24 • 25 • 26 • 27 | |
| Upstream: Lock and Dam No. 6 |
Downstream: Lock and Dam No. 8 |
