US Bridges

NB US 151& Ia 13 over Big Creek

Fair

Linn County, Iowa · 1.2 Mi. N of Jct. U.S. 30 · Structure no. 000000000033620

Built
1965
60 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
225 ft
3 main spans
Daily traffic
9,650
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 151& Ia 13 over Big Creek is a prestressed concrete stringer/multi-beam or girder carrying NB US 151& Ia 13 over Big Creek in Linn County, Iowa. It was built in 1965, so it is 60 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 9,650 vehicles a day, roughly 14% of them trucks, projected to reach 9,650 by 2043. The structure is 225 ft (68.6 m) long and 36 ft wide.

Location

Open in Google Maps
CarriesNB US 151& Ia 13
CrossesBig Creek
Location1.2 Mi. N of Jct. U.S. 30
RouteU.S. Route 151
CountyLinn County
StateIowa
Coordinates41.94132, -91.54493
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating89.2 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length225 ft (68.6 m)
Longest span81 ft (24.7 m)
Deck width36 ft (10.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,650 (2022)
Projected traffic9,650 by 2043
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was NB US 151& Ia 13 over Big Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is NB US 151& Ia 13 over Big Creek 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 November 2023.

How much traffic does NB US 151& Ia 13 over Big Creek carry?

About 9,650 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is NB US 151& Ia 13 over Big Creek?

The structure is 225 ft (68.6 m) long with a longest span of 81 ft (24.7 m) and a deck 36 ft wide.

Who owns NB US 151& Ia 13 over Big Creek?

It is owned by the State Highway Agency.