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Nearby Bridges in NBI 2021: 1


LOCAL 120TH ST over LITTLE SIOUX RIVER (Route: 0)
Num:179721x
Posted for load [P]
Built: 1971, Reconstructed: 1986
Historic: Bridge is not eligible for the NRHP. [5]

Google Streetview (If Available)

Rough Distance: 0 Miles (0 Kilometers)

Bridge Type
Main Span(s): Steel [3] Truss - Thru [10]
Approach Span(s): Steel [3] Stringer/Multi-beam or girder [02]
Deck: Wood or Timber [8] with Wearing Surface: Wood or Timber [7]
Bridge Dimensions
Length: 96.6 m = 316.9 ft
Main Spans: 1 at 45.7 m = 149.9 ft
Approach Spans: 4
Skew: 0
Width, Roadway: 6.2 m = 20.3 ft (2 Lanes) and Out-To-Out: 7.2 m = 23.6 ft for a 9.1 m = 29.9 ft approaching roadway.
Vertical Clearance: 4.39 m = 14.4 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Harrison County [085], Iowa [19]
Owned by County Highway Agency [02], DOT District: 0
81440703
Condition
Deck: Fair [5]
Superstructure: Poor [4]
Substructure: Fair [5]
Loading
Design: MS 18 / HS 20 [5]
Operating: 17.8 metric ton = 19.6 tons (Allowable Stress(AS) [2])
Inventory: 13.1 metric ton = 14.4 tons (Allowable Stress(AS) [2])
Appraisal
Structural: Meets minimum tolerable limits to be left in place as is [4]
Deck Geometry: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Road Alignment: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Inspections
Date: December 1999 [1299] and Frequency: 24
Future Work
Work Needed: Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Bridge Detour: 0.6 km = 0.4 mi
Traffic
ADT: 40 (2016) and Trucks: 0%
Future ADT: 40 (In 2039 )

Special Bridge Conditions Legend: R - Former location of relocated bridge. ! - At risk for demolition or destruction. X - Confirmed demolished or collapsed. S  - Dismantled and/or in storage. L -  Severe loss of historic integrity due to alteration.

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