US Bridges

SR W-36 over I-380

Good

Linn County, Iowa · At Jct. S.R. W36 · Structure no. 000000000605090

Built
1983
42 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
273 ft
4 main spans
Daily traffic
5,205
2022 count
Owner
State
State Highway Agency

About this bridge

SR W-36 over I-380 is a prestressed concrete stringer/multi-beam or girder carrying SR W-36 over I-380 in Linn County, Iowa. It was built in 1983, so it is 42 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 5,205 vehicles a day, roughly 11% of them trucks, projected to reach 5,205 by 2043. The structure is 273 ft (83.2 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR W-36
CrossesI-380
LocationAt Jct. S.R. W36
RouteCounty Highway 0
StateIowa
Coordinates42.17051, -91.77999
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.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99.8 US tons
Inventory rating45.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length273 ft (83.2 m)
Longest span92 ft (28 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,205 (2022)
Projected traffic5,205 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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 SR W-36 over I-380 built?

It was built in 1983, making it 42 years old in 2025.

What condition is SR W-36 over I-380 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 October 2023.

How much traffic does SR W-36 over I-380 carry?

About 5,205 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is SR W-36 over I-380?

The structure is 273 ft (83.2 m) long with a longest span of 92 ft (28 m) and a deck 47 ft wide.

Who owns SR W-36 over I-380?

It is owned by the State Highway Agency.