US Bridges

NB US 151 over Big Creek

Good

Linn County, Iowa · 4.7 Mi. N of Jct. Ia 13 · Structure no. 000000000606300

Built
1992
33 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
216 ft
3 main spans
Daily traffic
7,000
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 151 over Big Creek is a prestressed concrete stringer/multi-beam or girder carrying NB US 151 over Big Creek in Linn County, Iowa. It was built in 1992, so it is 33 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 7,000 vehicles a day, roughly 12% of them trucks, projected to reach 7,000 by 2042. The structure is 216 ft (65.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNB US 151
CrossesBig Creek
Location4.7 Mi. N of Jct. Ia 13
RouteU.S. Route 151
StateIowa
Coordinates42.05018, -91.46389
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating39.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length216 ft (65.8 m)
Longest span92 ft (28 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,000 (2022)
Projected traffic7,000 by 2042
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
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 over Big Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is NB US 151 over Big Creek 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 April 2024.

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

About 7,000 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is NB US 151 over Big Creek?

The structure is 216 ft (65.8 m) long with a longest span of 92 ft (28 m) and a deck 43 ft wide.

Who owns NB US 151 over Big Creek?

It is owned by the State Highway Agency.