US Bridges

FM & Austin Ave over Monona-Harrison Ditch

Good

Harrison County, Iowa · 081451404 · Structure no. 000000000028031

Built
2004
21 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
217 ft
3 main spans
Daily traffic
396
2023 count
Owner
County
County Highway Agency

About this bridge

FM & Austin Ave over Monona-Harrison Ditch is a prestressed concrete stringer/multi-beam or girder carrying FM & Austin Ave over Monona-Harrison Ditch in Harrison County, Iowa. It was built in 2004, so it is 21 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 396 vehicles a day, roughly 33% of them trucks, projected to reach 396 by 2043. The structure is 217 ft (66.1 m) long and 33 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesFM & Austin Ave
CrossesMonona-Harrison Ditch
Location081451404
RouteCounty Highway 0
CountyHarrison County
StateIowa
Coordinates41.82497, -96.05904
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.7 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length217 ft (66.1 m)
Longest span76 ft (23.2 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic396 (2023)
Projected traffic396 by 2043
Trucks33%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM & Austin Ave over Monona-Harrison Ditch built?

It was built in 2004, making it 21 years old in 2025.

What condition is FM & Austin Ave over Monona-Harrison Ditch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does FM & Austin Ave over Monona-Harrison Ditch carry?

About 396 vehicles per day (2023 count), of which roughly 33% are trucks.

How long is FM & Austin Ave over Monona-Harrison Ditch?

The structure is 217 ft (66.1 m) long with a longest span of 76 ft (23.2 m) and a deck 33 ft wide.

Who owns FM & Austin Ave over Monona-Harrison Ditch?

It is owned by the County Highway Agency.