IRR FM over Raven Creek

Good

Tama County, Iowa · 082160302 · Structure no. 000000000317241

Built: 2000; 25 years old
Condition: Good; inspected September 2022
Type: Slab; Concrete Continuous
Length: 128 ft; 3 main spans
Daily traffic: 471; 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 2000, so it is 25 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 471 vehicles a day, projected to reach 471 by 2043. The structure is 128 ft (39 m) long and 33 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

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CarriesIRR FM

CrossesRaven Creek

Location082160302

RouteCounty Highway 0

CountyTama County

StateIowa

Coordinates41.9487, -92.70759

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.

Component	Rating	Meaning
Deck	7 Good	Some minor problems.
Superstructure	7 Good	Some minor problems.
Substructure	8 Very Good	No problems noted.
Channel and channel protection	8 Very Good	No problems noted.

Last inspectionSeptember 2022

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 adequacy9: Superior to present desirable criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating97.6 US tons

Inventory rating58.3 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length128 ft (39 m)

Longest span49 ft (14.9 m)

Deck width33 ft (10.2 m)

Roadway width33 ft (10 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic471 (2022)

Projected traffic471 by 2043

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed28 mi (45 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 2000, making it 25 years old in 2025.

What condition is IRR FM over Raven Creek 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 September 2022.

How much traffic does IRR FM over Raven Creek carry?

About 471 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 49 ft (14.9 m) and a deck 33 ft wide.

Who owns IRR FM over Raven Creek?

It is owned by the County Highway Agency.