US Bridges

FM Ridge RD over Allison Creek

Fair

Delaware County, Iowa · 088042603 · Structure no. 000000000140782

Built
2003
22 years old
Condition
Fair
inspected January 2024
Type
Tee Beam
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
44
2022 count
Owner
County
County Highway Agency

About this bridge

FM Ridge RD over Allison Creek is a prestressed concrete tee beam carrying FM Ridge RD over Allison Creek in Delaware County, Iowa. It was built in 2003, so it is 22 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 44 vehicles a day, projected to reach 44 by 2044. The structure is 51 ft (15.5 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFM Ridge RD
CrossesAllison Creek
Location088042603
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.40384, -91.2815
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating37.5 US tons
Inventory rating28.9 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span50 ft (15.2 m)
Deck width32 ft (9.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44 (2022)
Projected traffic44 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM Ridge RD over Allison Creek built?

It was built in 2003, making it 22 years old in 2025.

What condition is FM Ridge RD over Allison Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does FM Ridge RD over Allison Creek carry?

About 44 vehicles per day (2022 count).

How long is FM Ridge RD over Allison Creek?

The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 32 ft wide.

Who owns FM Ridge RD over Allison Creek?

It is owned by the County Highway Agency.