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Nearby Bridges in NBI 2021: 2


IA 21 over IOWA RIVER (Route: 21)
Num:29401x
Open: no restriction [A]
Built: 1982, 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): Prestressed concrete [5] 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: 191.4 m = 628.0 ft
Main Spans: 7 at 29.6 m = 97.1 ft
Approach Spans: 0
Skew: 7
Width, Roadway: 13.5 m = 44.3 ft (2 Lanes) and Out-To-Out: 14.4 m = 47.2 ft for a 14.6 m = 47.9 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Iowa County [095], Iowa [19]
Owned by State Highway Agency [01], DOT District: 6
1.1 mi. N of Jct. IA #212
Condition
Deck: Satisfactory [6]
Superstructure: Good [7]
Substructure: Satisfactory [6]
Loading
Design: MS 18 / HS 20 [5]
Operating: 90.5 metric ton = 99.6 tons (Load Factor(LF) [1])
Inventory: 43.9 metric ton = 48.3 tons (Load Factor(LF) [1])
Appraisal
Structural: Equal to present minimum criteria [6]
Deck Geometry: Superior to present desirable criteria [9]
Road Alignment: Better than present minimum criteria [7]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Inspections
Date: July 1999 [799] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 1 km = 0.6 mi
Traffic
ADT: 2550 (2019) and Trucks: 7%
Future ADT: 2550 (In 2039 )
IA 21 over IOWA RIVER OVERFLOW (Route: 21)
Num:14401x
Open: no restriction [A]
Built: 1982, Reconstructed: N/A [0000]
Historic: Bridge is not eligible for the NRHP. [5]

Google Streetview (If Available)

Rough Distance: 0.5 Miles (0.7 Kilometers)

Bridge Type
Main Span(s): Concrete continuous [2] Slab [01]
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: 62.2 m = 204.1 ft
Main Spans: 5 at 13.4 m = 44.0 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 13.5 m = 44.3 ft (2 Lanes) and Out-To-Out: 14.5 m = 47.6 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]: Benton County [011], Iowa [19]
Owned by State Highway Agency [01], DOT District: 6
1.6 mi. N of jct. IA 212
Condition
Deck: Satisfactory [6]
Superstructure: Satisfactory [6]
Substructure: Good [7]
Loading
Design: MS 18 / HS 20 [5]
Operating: 81.6 metric ton = 89.8 tons (Allowable Stress(AS) [2])
Inventory: 49 metric ton = 53.9 tons (Allowable Stress(AS) [2])
Appraisal
Structural: Equal to present minimum criteria [6]
Deck Geometry: Superior to present desirable criteria [9]
Road Alignment: Equal to present desirable criteria [8]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Inspections
Date: May 2020 [0520] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 3.2 km = 2.0 mi
Traffic
ADT: 2550 (2019) and Trucks: 7%
Future ADT: 2550 (In 2040 )

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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