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Nearby Bridges in NBI 2021: 1


US 30 over BOYER RIVER (Route: 30)
Num:21260x
Open: no restriction [A]
Built: 1959, Reconstructed: N/A [0000]
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 continuous [4] Stringer/Multi-beam or girder [02]
Approach Span(s): Other [00]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Low slump Concrete [4]
Bridge Dimensions
Length: 99.1 m = 325.1 ft
Main Spans: 3 at 37.5 m = 123.0 ft
Approach Spans: 0
Skew: 30
Width, Roadway: 9.2 m = 30.2 ft (2 Lanes) and Out-To-Out: 11 m = 36.1 ft for a 13.4 m = 44.0 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Crawford County [047], Iowa [19]
Owned by State Highway Agency [01], DOT District: 3
0.8 mi. E of SR M14
Condition
Deck: Satisfactory [6]
Superstructure: Good [7]
Substructure: Fair [5]
Loading
Design: MS 18 / HS 20 [5]
Operating: 44.4 metric ton = 48.8 tons (Load Factor(LF) [1])
Inventory: 26.3 metric ton = 28.9 tons (Load Factor(LF) [1])
Appraisal
Structural: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck Geometry: Meets minimum tolerable limits to be left in place as is [4]
Road Alignment: Equal to present desirable criteria [8]
Waterway: Equal to present minimum criteria [6] and Countermeasures have been installed to mitigate an existing problem with scour. [7]
Inspections
Date: August 1999 [899] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 1.3 km = 0.8 mi
Traffic
ADT: 3100 (2019) and Trucks: 22%
Future ADT: 3100 (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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