Lock and Dam No. 7

Infobox_Dam
dam_name=

---

caption=Mississippi River Lock and Dam number 7
official_name=
crosses= Upper Mississippi River
reservoir=Pool 7
locale=La Crescent, Minnesota
maint= United States Army Corps of Engineers
length= convert|940|ft|m|1 (movable portion)
height=
width=
began=1933
open=April 1937
closed=
reservoir_capacity=
reservoir_catchment=
reservoir_surface=
coordinates= coor dms|43|52|01|N|91|18|26|W|region:US_type:landmark
extra=

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 convert|940|ft|m|1 long, five roller gates and 11 tainter gates. Two segments of earth embankment convert|8100|ft|m|1 long from dam to French Island. One concrete spillway convert|1000|ft|m|1 long. And convert|2400|ft|m|1 long from French Island, Wisconsin to Onalaska, Wisconsin. The concrete spillway is convert|670|ft|m|1 long and the lock is convert|110|ft|m|1 wide by convert|600|ft|m|1 long. [http://www.mvp.usace.army.mil/navigation/default.asp?pageid=145&subpageid=167]

ee also

*I-90 Mississippi River Bridge, just downstream.

Notes

External links

* [http://www.umesc.usgs.gov/rivers/upper_mississippi/reach_1/pool_7/pool_7.html USGS Reach 1 pool 7]
* [http://www.mvp.usace.army.mil/navigation/default.asp?pageid=145&subpageid=167 USACE - Lock and Dam 7]
* [http://hdl.loc.gov/loc.pnp/hhh.mn0118 Survey number HAER MN-24 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 7, Dresbach vicinity, Winona County, MN]