US Bridges

US 30 over Boyer River

Fair

Crawford County, Iowa · 0.8 Mi. E of SR M14 · Structure no. 000000000021260

Built
1959
66 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
325 ft
3 main spans
Daily traffic
3,020
2022 count
Owner
State
State Highway Agency

About this bridge

US 30 over Boyer River is a steel continuous stringer/multi-beam or girder carrying US 30 over Boyer River in Crawford County, Iowa. It was built in 1959, so it is 66 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 5 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 3,020 vehicles a day, roughly 25% of them trucks, projected to reach 3,020 by 2043. The structure is 325 ft (99.1 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesUS 30
CrossesBoyer River
Location0.8 Mi. E of SR M14
RouteU.S. Route 30
CountyCrawford County
StateIowa
Coordinates41.93663, -95.48047
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 rating48.9 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length325 ft (99.1 m)
Longest span123 ft (37.5 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,020 (2022)
Projected traffic3,020 by 2043
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US 30 over Boyer River built?

It was built in 1959, making it 66 years old in 2025.

What condition is US 30 over Boyer 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 May 2023.

How much traffic does US 30 over Boyer River carry?

About 3,020 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is US 30 over Boyer River?

The structure is 325 ft (99.1 m) long with a longest span of 123 ft (37.5 m) and a deck 36 ft wide.

Who owns US 30 over Boyer River?

It is owned by the State Highway Agency.