US Bridges

Irr-Fm over Raven Creek

Fair

Tama County, Iowa · 083162605 · Structure no. 000000000318421

Built
1981
44 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete Continuous
Length
128 ft
3 main spans
Daily traffic
432
2022 count
Owner
County
County Highway Agency

About this bridge

Irr-Fm over Raven Creek is a concrete continuous slab carrying Irr-Fm over Raven Creek in Tama County, Iowa. It was built in 1981, so it is 44 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 432 vehicles a day, projected to reach 432 by 2044. The structure is 128 ft (39 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIrr-Fm
CrossesRaven Creek
Location083162605
RouteCounty Highway 0
CountyTama County
StateIowa
Coordinates41.96471, -92.67016
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.4 US tons
Inventory rating33.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length128 ft (39 m)
Longest span44 ft (13.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic432 (2022)
Projected traffic432 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Irr-Fm over Raven Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is Irr-Fm over Raven 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 October 2024.

How much traffic does Irr-Fm over Raven Creek carry?

About 432 vehicles per day (2022 count).

How long is Irr-Fm over Raven Creek?

The structure is 128 ft (39 m) long with a longest span of 44 ft (13.4 m) and a deck 32 ft wide.

Who owns Irr-Fm over Raven Creek?

It is owned by the County Highway Agency.