US Bridges

305 TH / E57 over Raccoon River

FairPosted for load

Greene County, Iowa · 082291805 · Structure no. 000000000161620

Built
1940
85 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
380 ft
5 main spans
Daily traffic
170
2022 count
Owner
County
County Highway Agency

About this bridge

305 TH / E57 over Raccoon River is a steel continuous stringer/multi-beam or girder carrying 305 TH / E57 over Raccoon River in Greene County, Iowa. It was built in 1940, so it is 85 years old, older 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. Its operating status is: posted for load restriction.

It carries about 170 vehicles a day, roughly 15% of them trucks, projected to reach 170 by 2044. The structure is 380 ft (115.8 m) long and 24 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
Carries305 TH / E57
CrossesRaccoon River
Location082291805
RouteCounty Highway 0
CountyGreene County
StateIowa
Coordinates41.91385, -94.27598
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.4 US tons
Inventory rating20.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length380 ft (115.8 m)
Longest span82 ft (25 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic170 (2022)
Projected traffic170 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 305 TH / E57 over Raccoon River built?

It was built in 1940, making it 85 years old in 2025.

What condition is 305 TH / E57 over Raccoon River 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 July 2024.

How much traffic does 305 TH / E57 over Raccoon River carry?

About 170 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is 305 TH / E57 over Raccoon River?

The structure is 380 ft (115.8 m) long with a longest span of 82 ft (25 m) and a deck 24 ft wide.

Who owns 305 TH / E57 over Raccoon River?

It is owned by the County Highway Agency.