US Bridges

J ST over US 30

Fair

Linn County, Iowa · 0.2 Mi. E of Jct. I-380 · Structure no. 000000000600602

Built
1975
50 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
391 ft
5 main spans
Daily traffic
1,261
2022 count
Owner
State
State Highway Agency

About this bridge

J ST over US 30 is a steel continuous stringer/multi-beam or girder carrying J ST over US 30 in Linn County, Iowa. It was built in 1975, so it is 50 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.

It carries about 1,261 vehicles a day, projected to reach 1,261 by 2043. The structure is 391 ft (119.2 m) long and 65 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesJ ST
CrossesUS 30
Location0.2 Mi. E of Jct. I-380
RouteCity Street 0
CountyLinn County
StateIowa
Coordinates41.92739, -91.66651
Functional classUrban Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55 US tons
Inventory rating33.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length391 ft (119.2 m)
Longest span96 ft (29.3 m)
Deck width65 ft (19.8 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,261 (2022)
Projected traffic1,261 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 J ST over US 30 built?

It was built in 1975, making it 50 years old in 2025.

What condition is J ST over US 30 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 October 2023.

How much traffic does J ST over US 30 carry?

About 1,261 vehicles per day (2022 count).

How long is J ST over US 30?

The structure is 391 ft (119.2 m) long with a longest span of 96 ft (29.3 m) and a deck 65 ft wide.

Who owns J ST over US 30?

It is owned by the State Highway Agency.