US Bridges

Ia 1 over Crow Creek

Fair

Jefferson County, Iowa · 0.7 Mi. N of JCT SR W21 · Structure no. 000000000604450

Built
1928
97 years old, rebuilt 1979
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
4,100
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 1 over Crow Creek is a concrete continuous culvert carrying Ia 1 over Crow Creek in Jefferson County, Iowa. It was built in 1928 and reconstructed in 1979, so it is 97 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 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 4,100 vehicles a day, roughly 4% of them trucks, projected to reach 4,100 by 2042. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIa 1
CrossesCrow Creek
Location0.7 Mi. N of JCT SR W21
RouteState Highway 1
CountyJefferson County
StateIowa
Coordinates41.02007, -91.96805
Functional classUrban Other Principal 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating20.3 US tons
Inventory rating15 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length21 ft (6.4 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,100 (2022)
Projected traffic4,100 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 1 over Crow Creek built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1979.

What condition is Ia 1 over Crow 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 May 2023.

How much traffic does Ia 1 over Crow Creek carry?

About 4,100 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Ia 1 over Crow Creek?

The structure is 21 ft (6.4 m) long with a longest span of 11 ft (3.4 m).

Who owns Ia 1 over Crow Creek?

It is owned by the State Highway Agency.