Length of largest span: 626.8 ft.
Total length: 3,507.0 ft. (0.7 mi.)
Deck width: 23.9 ft.
Vertical clearance above deck: 14.2 ft.
Mark Twain Memorial Bridge (official name)
Hannibal Bridge (common name)
Approximate latitude, longitude
+39.71630, -91.35379(decimal degrees) 39°42'59" N, 91°21'14" W (degrees°minutes'seconds")
Approximate UTM coordinates
T. 57 N., R. 4 W., Sec. 21
USGS topographic map
MoDOT K-931A1 (Missouri Dept. of Transportation bridge number)
MoDOT K-931 (Missouri Dept. of Transportation bridge number)
BH 21999 (Bridgehunter.com ID)
Inspection (as of 09/1999)
Deck condition rating: Serious(3 out of 9) Superstructure condition rating: Fair(5 out of 9) Substructure condition rating: Fair(5 out of 9) Appraisal: Structurally deficient
Sufficiency rating: 8.0 (out of 100)
Average daily traffic (as of 1997)
May 12, 2008: New photos from Historic American Engineering Record
May 1, 2006: Posted additional photo from David Birckhead
HAER MO-77 - Mark Twain Memorial Bridge, Spanning Mississippi River at US Route 36, Hannibal, Marion County, MO