US Bridges

NB US 151/922 over US 30 W JCT

Fair

Linn County, Iowa · At Jct. 30 · Structure no. 000000000604110

Built
1980
45 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
365 ft
4 main spans
Daily traffic
6,300
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 151/922 over US 30 W JCT is a steel continuous stringer/multi-beam or girder carrying NB US 151/922 over US 30 W JCT in Linn County, Iowa. It was built in 1980, so it is 45 years old, younger 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 6,300 vehicles a day, roughly 5% of them trucks, projected to reach 6,300 by 2042. The structure is 365 ft (111.3 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesNB US 151/922
CrossesUS 30 W JCT
LocationAt Jct. 30
RouteState Highway 922
CountyLinn County
StateIowa
Coordinates41.94488, -91.74151
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.6 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length365 ft (111.3 m)
Longest span116 ft (35.4 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2022)
Projected traffic6,300 by 2042
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB US 151/922 over US 30 W JCT built?

It was built in 1980, making it 45 years old in 2025.

What condition is NB US 151/922 over US 30 W JCT 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 March 2023.

How much traffic does NB US 151/922 over US 30 W JCT carry?

About 6,300 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is NB US 151/922 over US 30 W JCT?

The structure is 365 ft (111.3 m) long with a longest span of 116 ft (35.4 m) and a deck 43 ft wide.

Who owns NB US 151/922 over US 30 W JCT?

It is owned by the State Highway Agency.