Black Hawk Bridge

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Black Hawk Bridge
View mt hosmer.jpg
Other name(s) Lansing Bridge
Carries 2 lanes of IA 9 and WI 82
Crosses Upper Mississippi River
Locale Lansing, Iowa and Crawford County, Wisconsin, River Mile 663.4
Maintained by Iowa and Wisconsin Departments of Transportation
ID number NBI 000000000013520
Design Cantilever through truss
Total length 1,653 feet (504 m)
Width 21 feet (6 m), 2 Lanes
Longest span 200 m
Clearance below 68 feet (21 m)
Opened June 17, 1931
Toll None
Daily traffic 2,357 (2003)
Coordinates 43°21′55″N 91°12′54″W / 43.36528°N 91.21500°W / 43.36528; -91.21500Coordinates: 43°21′55″N 91°12′54″W / 43.36528°N 91.21500°W / 43.36528; -91.21500

The Black Hawk Bridge spans the Mississippi River, joining the town of Lansing, in Allamakee County, Iowa, to rural Crawford County, Wisconsin. It is the northernmost Mississippi River bridge in Iowa.

The Black Hawk Bridge at dusk, looking northeast.

Named for Chief Black Hawk, it is popularly referred to as the "Lansing bridge". It carries Iowa Highway 9 and Wisconsin Highway 82.

This riveted cantilever through truss bridge (other examples) has one of the more unusual designs of any Mississippi River bridge. Construction started in 1929 and was completed in 1931. The designer and chief engineer was Melvin B. Stone. The McClintic-Marshall Company of Chicago erected the trusses. The steel came from the Inland Steel Company.

Aerial view looking north, January 14, 2001, with River at floodstage; click to enlarge. (USGS, Upper Midwest Environmental Sciences Center)

The Wisconsin approach has a long causeway over Winneshiek bottoms (sloughs, ponds, and backwaters) before ramping up to the bridge itself. The main shipping channel is on the Iowa side. The Iowa approach is rather abrupt, going from a 25 mph city street straight up a steep ramp onto the bridge.

Originally a privately built and operated bridge owned by the Iowa-Wisconsin Bridge Company, it was closed between 1945 and 1957, due to damage from ice damming, and lacking funds to repair the bridge, the company went out of business. The two states acquired the bridge and repaired it.

In August 2011 the bridge was once again closed for repairs.

View from northwest, showing Wisconsin shore, with a barge crossing underneath (Library of Congress/HAER)

The bridge has a sufficiency rating of 39.9%, which mainly reflects its obsolete nature.

Closure[edit]

During an inspection on on August 17, 2011, a crack was found in a floor beam under the bridge deck and the bridge was closed.[1] The bridge was reopened on August 23, 2011.[2]

See also[edit]

Notes[edit]

  1. ^ "Iowa 9 bridge closed over the Mississippi River at Lansing". Iowa DOT Website. http://www.news.iowadot.gov/newsandinfo/2011/08/iowa-9-bridge-closed-over-the-mississippi-river-at-lansing.html. 
  2. ^ "Iowa DOT to reopen Iowa 9 bridge over the Mississippi River at Lansing today". Iowa DOT Website. http://www.news.iowadot.gov/newsandinfo/2011/08/iowa-dot-to-reopen-iowa-9-bridge-over-the-mississippi-river-at-lansing-today.html. 

References[edit]