Black Hawk Bridge
|Black Hawk Bridge|
|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|
|Daily traffic||2,357 (2003)|
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.
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.
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.
The bridge has a sufficiency rating of 39.9%, which mainly reflects its obsolete nature.
- "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.
- "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.
- Iowa Department of Transportation, retrieved July 28, 2007
- Black Hawk Bridge Superb site, with pictures and statistics, retrieved July 28, 2007
- NationalBridges.com, retrieved August 7, 2007
- Black Hawk Bridge at Structurae. Retrieved on July 28, 2007.
- Historic American Engineering Record (HAER) No. IA-43, "Black Hawk Bridge, Spanning Mississippi River at State Highway 9, Lansing, Allamakee County, IA", 13 photos, 1 color transparency, 11 data pages, 1 photo caption page