US Bridges

15th Ave S over Dd #1

Good

Webster County, Iowa · 089283303 · Structure no. 000000000343281

Built
2018
7 years old
Condition
Good
inspected November 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
79 ft
1 main span
Daily traffic
1,875
2022 count
Owner
County
County Highway Agency

About this bridge

15th Ave S over Dd #1 is a prestressed concrete stringer/multi-beam or girder carrying 15th Ave S over Dd #1 in Webster County, Iowa. It was built in 2018, so it is 7 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,875 vehicles a day, roughly 16% of them trucks, projected to reach 1,875 by 2041. The structure is 79 ft (24.1 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries15th Ave S
CrossesDd #1
Location089283303
RouteCounty Highway 0
CountyWebster County
StateIowa
Coordinates42.48666, -94.15152
Functional classRural 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable 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 alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length79 ft (24.1 m)
Longest span75 ft (22.9 m)
Deck width44 ft (13.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,875 (2022)
Projected traffic1,875 by 2041
Trucks16%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 15th Ave S over Dd #1 built?

It was built in 2018, making it 7 years old in 2025.

What condition is 15th Ave S over Dd #1 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 2021.

How much traffic does 15th Ave S over Dd #1 carry?

About 1,875 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is 15th Ave S over Dd #1?

The structure is 79 ft (24.1 m) long with a longest span of 75 ft (22.9 m) and a deck 44 ft wide.

Who owns 15th Ave S over Dd #1?

It is owned by the County Highway Agency.