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Nearby Bridges in NBI 2021: 1


420TH over BIG CEDAR RIVER (Route: 0)
Num:248710x
Open: no restriction [A]
Built: 1963, Reconstructed: N/A [0000]
Historic: Bridge is not eligible for the NRHP. [5]

Google Streetview (If Available)

Rough Distance: 0 Miles (0.1 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: Monolithic Concrete (concurrently placed with structural deck) [1]
Bridge Dimensions
Length: 108.5 m = 356.0 ft
Main Spans: 5 at 23.8 m = 78.1 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 8.5 m = 27.9 ft (2 Lanes) and Out-To-Out: 9.2 m = 30.2 ft for a 9.1 m = 29.9 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Mitchell County [131], Iowa [19]
Owned by County Highway Agency [02], DOT District: 0
99182603
Condition
Deck: Good [7]
Superstructure: Very Good [8]
Substructure: Good [7]
Loading
Design: M 18 / H 20 [4]
Operating: 38 metric ton = 41.8 tons (Load Factor(LF) [1])
Inventory: 22.7 metric ton = 25.0 tons (Load Factor(LF) [1])
Appraisal
Structural: Equal to present minimum criteria [6]
Deck Geometry: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Road Alignment: Equal to present desirable criteria [8]
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: 1.9 km = 1.2 mi
Traffic
ADT: 640 (2017) and Trucks: 18%
Future ADT: 640 (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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