US Bridges

13th ST over Ioway Creek (13th)

Good

Story County, Iowa · City of Ames · Structure no. 000000000501520

Built
1974
51 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
231 ft
3 main spans
Daily traffic
9,563
2022 count
Owner
State
Other State Agency

About this bridge

13th ST over Ioway Creek (13th) is a prestressed concrete stringer/multi-beam or girder carrying 13th ST over Ioway Creek (13th) in Story County, Iowa. It was built in 1974, so it is 51 years old, older 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 9,563 vehicles a day, projected to reach 9,563 by 2044. The structure is 231 ft (70.4 m) long and 65 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries13th ST
CrossesIoway Creek (13th)
LocationCity of Ames
RouteCity Street 0
CountyStory County
StateIowa
Coordinates42.03453, -93.63539
Functional classUrban Minor Arterial

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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.8 US tons
Inventory rating26.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length231 ft (70.4 m)
Longest span96 ft (29.3 m)
Deck width65 ft (19.8 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,563 (2022)
Projected traffic9,563 by 2044
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther State 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 13th ST over Ioway Creek (13th) built?

It was built in 1974, making it 51 years old in 2025.

What condition is 13th ST over Ioway Creek (13th) 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 November 2024.

How much traffic does 13th ST over Ioway Creek (13th) carry?

About 9,563 vehicles per day (2022 count).

How long is 13th ST over Ioway Creek (13th)?

The structure is 231 ft (70.4 m) long with a longest span of 96 ft (29.3 m) and a deck 65 ft wide.

Who owns 13th ST over Ioway Creek (13th)?

It is owned by the Other State Agency and maintained by the State Highway Agency.