US Bridges

US 71 over Bluegrass Creek

Good

Audubon County, Iowa · 1.4 Mi. S of Jct. SR F32 · Structure no. 000000000014141

Built
2006
19 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
209 ft
3 main spans
Daily traffic
3,080
2022 count
Owner
State
State Highway Agency

About this bridge

US 71 over Bluegrass Creek is a prestressed concrete stringer/multi-beam or girder carrying US 71 over Bluegrass Creek in Audubon County, Iowa. It was built in 2006, so it is 19 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 3,080 vehicles a day, roughly 14% of them trucks, projected to reach 3,080 by 2044. The structure is 209 ft (63.7 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 71
CrossesBluegrass Creek
Location1.4 Mi. S of Jct. SR F32
RouteU.S. Route 71
StateIowa
Coordinates41.71257, -94.92928
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.7 US tons
Inventory rating42.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length209 ft (63.7 m)
Longest span69 ft (21 m)
Deck width58 ft (17.7 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,080 (2022)
Projected traffic3,080 by 2044
Trucks14%
Lanes on structure2
Traffic directionTwo-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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 71 over Bluegrass Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is US 71 over Bluegrass 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 September 2024.

How much traffic does US 71 over Bluegrass Creek carry?

About 3,080 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is US 71 over Bluegrass Creek?

The structure is 209 ft (63.7 m) long with a longest span of 69 ft (21 m) and a deck 58 ft wide.

Who owns US 71 over Bluegrass Creek?

It is owned by the State Highway Agency.