US Bridges

South ST over Blue Grass Creek

Good

Audubon County, Iowa · City of Audubon · Structure no. 000000000000511

Built
2003
22 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
90 ft
3 main spans
Daily traffic
1,423
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

South ST over Blue Grass Creek is a concrete continuous slab carrying South ST over Blue Grass Creek in Audubon County, Iowa. It was built in 2003, so it is 22 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 1,423 vehicles a day, roughly 7% of them trucks, projected to reach 1,423 by 2044. The structure is 90 ft (27.4 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesSouth ST
CrossesBlue Grass Creek
LocationCity of Audubon
RouteCity Street 0
StateIowa
Coordinates41.71708, -94.93442
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72.9 US tons
Inventory rating43.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span35 ft (10.7 m)
Deck width43 ft (13.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,423 (2022)
Projected traffic1,423 by 2044
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 South ST over Blue Grass Creek built?

It was built in 2003, making it 22 years old in 2025.

What condition is South ST over Blue Grass 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 South ST over Blue Grass Creek carry?

About 1,423 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is South ST over Blue Grass Creek?

The structure is 90 ft (27.4 m) long with a longest span of 35 ft (10.7 m) and a deck 43 ft wide.

Who owns South ST over Blue Grass Creek?

It is owned by the City or Municipal Highway Agency.