US Bridges

D Avenue over Nishnabotna River

PoorClosed to traffic

Page County, Iowa · 070392302 · Structure no. 000000000268530

Built
1949
76 years old
Condition
Poor
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
365 ft
3 main spans
Daily traffic
477
2022 count
Owner
County
County Highway Agency

About this bridge

D Avenue over Nishnabotna River is a steel continuous stringer/multi-beam or girder carrying D Avenue over Nishnabotna River in Page County, Iowa. It was built in 1949, so it is 76 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 0 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: closed to all traffic.

It carries about 477 vehicles a day, roughly 18% of them trucks, projected to reach 477 by 2044. The structure is 365 ft (111.3 m) long and 24 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesD Avenue
CrossesNishnabotna River
Location070392302
RouteCounty Highway 0
StateIowa
Coordinates40.85457, -95.30861
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck0 FailedOut of service and beyond corrective action.
Superstructure0 FailedOut of service and beyond corrective action.
Substructure0 FailedOut of service and beyond corrective action.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating0 US tons
Inventory rating0 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+1 approach)
Design loadH 15
Structure length365 ft (111.3 m)
Longest span126 ft (38.4 m)
Deck width24 ft (7.2 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic477 (2022)
Projected traffic477 by 2044
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was D Avenue over Nishnabotna River built?

It was built in 1949, making it 76 years old in 2025.

What condition is D Avenue over Nishnabotna River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2024.

How much traffic does D Avenue over Nishnabotna River carry?

About 477 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is D Avenue over Nishnabotna River?

The structure is 365 ft (111.3 m) long with a longest span of 126 ft (38.4 m) and a deck 24 ft wide.

Who owns D Avenue over Nishnabotna River?

It is owned by the County Highway Agency.