US Bridges

Ia 316 over NS & BNSF RR

Fair

Marion County, Iowa · 2.4 Mi. N of Ia 5 · Structure no. 000000000241460

Built
1967
58 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
205 ft
3 main spans
Daily traffic
990
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 316 over NS & BNSF RR is a steel continuous stringer/multi-beam or girder carrying Ia 316 over NS & BNSF RR in Marion County, Iowa. It was built in 1967, so it is 58 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 990 vehicles a day, roughly 16% of them trucks, projected to reach 990 by 2042. The structure is 205 ft (62.5 m) long and 32 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesIa 316
CrossesNS & BNSF RR
Location2.4 Mi. N of Ia 5
RouteState Highway 316
CountyMarion County
StateIowa
Coordinates41.47191, -93.32805
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating44.4 US tons
Inventory rating26.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length205 ft (62.5 m)
Longest span81 ft (24.7 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic990 (2022)
Projected traffic990 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ia 316 over NS & BNSF RR built?

It was built in 1967, making it 58 years old in 2025.

What condition is Ia 316 over NS & BNSF RR 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 June 2023.

How much traffic does Ia 316 over NS & BNSF RR carry?

About 990 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Ia 316 over NS & BNSF RR?

The structure is 205 ft (62.5 m) long with a longest span of 81 ft (24.7 m) and a deck 32 ft wide.

Who owns Ia 316 over NS & BNSF RR?

It is owned by the State Highway Agency.