US Bridges

Ia 149 over South Skunk River

Fair

Keokuk County, Iowa · 4.0 Mi. N of Ia 78 · Structure no. 000000000032771

Built
1986
39 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
517 ft
6 main spans
Daily traffic
1,190
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 149 over South Skunk River is a prestressed concrete stringer/multi-beam or girder carrying Ia 149 over South Skunk River in Keokuk County, Iowa. It was built in 1986, so it is 39 years old, younger 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 6 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 1,190 vehicles a day, roughly 28% of them trucks, projected to reach 1,190 by 2043. The structure is 517 ft (157.6 m) long and 44 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesIa 149
CrossesSouth Skunk River
Location4.0 Mi. N of Ia 78
RouteState Highway 149
CountyKeokuk County
StateIowa
Coordinates41.23492, -92.21396
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating92.6 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length517 ft (157.6 m)
Longest span97 ft (29.6 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,190 (2022)
Projected traffic1,190 by 2043
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 149 over South Skunk River built?

It was built in 1986, making it 39 years old in 2025.

What condition is Ia 149 over South Skunk River 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 August 2023.

How much traffic does Ia 149 over South Skunk River carry?

About 1,190 vehicles per day (2022 count), of which roughly 28% are trucks.

How long is Ia 149 over South Skunk River?

The structure is 517 ft (157.6 m) long with a longest span of 97 ft (29.6 m) and a deck 44 ft wide.

Who owns Ia 149 over South Skunk River?

It is owned by the State Highway Agency.