- 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 nearOnalaska, Wisconsin on the UpperMississippi River . It forms pool 7 andLake Onalaska .The facility is located on Mississippi
River mile 702.5 nearLa 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 gate s. Two segments of earth embankment convert|8100|ft|m|1 long from dam to French Island. One concretespillway convert|1000|ft|m|1 long. And convert|2400|ft|m|1 long fromFrench Island, Wisconsin toOnalaska, 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]
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