US Bridges

Ia 15 over Pilot Creek

Fair

Pocahontas County, Iowa · At the N Jct. of SR C26 · Structure no. 000000000040310

Built
1957
68 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
144 ft
3 main spans
Daily traffic
510
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 15 over Pilot Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 15 over Pilot Creek in Pocahontas County, Iowa. It was built in 1957, so it is 68 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 510 vehicles a day, roughly 19% of them trucks, projected to reach 510 by 2043. The structure is 144 ft (43.9 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIa 15
CrossesPilot Creek
LocationAt the N Jct. of SR C26
RouteState Highway 15
CountyPocahontas County
StateIowa
Coordinates42.81894, -94.5279
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 23 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating14.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length144 ft (43.9 m)
Longest span56 ft (17.1 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic510 (2022)
Projected traffic510 by 2043
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 15 over Pilot Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Ia 15 over Pilot Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2023.

How much traffic does Ia 15 over Pilot Creek carry?

About 510 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is Ia 15 over Pilot Creek?

The structure is 144 ft (43.9 m) long with a longest span of 56 ft (17.1 m) and a deck 34 ft wide.

Who owns Ia 15 over Pilot Creek?

It is owned by the State Highway Agency.