US Bridges

Irish ST over Otter Creek

Good

Tama County, Iowa · 082131701 · Structure no. 000000000001871

Built
1994
31 years old
Condition
Good
inspected September 2022
Type
Slab
Concrete Continuous
Length
176 ft
4 main spans
Daily traffic
360
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Irish ST over Otter Creek is a concrete continuous slab carrying Irish ST over Otter Creek in Tama County, Iowa. It was built in 1994, so it is 31 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 360 vehicles a day, projected to reach 360 by 2043. The structure is 176 ft (53.6 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIrish ST
CrossesOtter Creek
Location082131701
RouteCity Street 0
StateIowa
Coordinates41.9203, -92.38837
Functional classRural Local

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 inspectionSeptember 2022
Inspection intervalevery 48 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.1 US tons
Inventory rating57.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span49 ft (14.9 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic360 (2022)
Projected traffic360 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$17,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Irish ST over Otter Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Irish ST over Otter 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 2022.

How much traffic does Irish ST over Otter Creek carry?

About 360 vehicles per day (2022 count).

How long is Irish ST over Otter Creek?

The structure is 176 ft (53.6 m) long with a longest span of 49 ft (14.9 m) and a deck 27 ft wide.

Who owns Irish ST over Otter Creek?

It is owned by the City or Municipal Highway Agency.