US Bridges

US 151 over Mill Race Creek

Good

Iowa County, Iowa · 0.4 Mi. S of Jct. 220 · Structure no. 000000000029571

Built
2011
14 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
93 ft
3 main spans
Daily traffic
5,500
2022 count
Owner
State
State Highway Agency

About this bridge

US 151 over Mill Race Creek is a concrete continuous slab carrying US 151 over Mill Race Creek in Iowa County, Iowa. It was built in 2011, so it is 14 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 5,500 vehicles a day, roughly 12% of them trucks, projected to reach 5,500 by 2044. The structure is 93 ft (28.3 m) long and 47 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesUS 151
CrossesMill Race Creek
Location0.4 Mi. S of Jct. 220
RouteU.S. Route 151
StateIowa
Coordinates41.79629, -91.87507
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length93 ft (28.3 m)
Longest span35 ft (10.7 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,500 (2022)
Projected traffic5,500 by 2044
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 US 151 over Mill Race Creek built?

It was built in 2011, making it 14 years old in 2025.

What condition is US 151 over Mill Race 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 August 2024.

How much traffic does US 151 over Mill Race Creek carry?

About 5,500 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is US 151 over Mill Race Creek?

The structure is 93 ft (28.3 m) long with a longest span of 35 ft (10.7 m) and a deck 47 ft wide.

Who owns US 151 over Mill Race Creek?

It is owned by the State Highway Agency.