US Bridges

Ia 1 over Big Cedar Creek

Fair

Jefferson County, Iowa · 2.9 Mi. S of Jct. US 34 · Structure no. 000000000031370

Built
1967
58 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
284 ft
3 main spans
Daily traffic
2,730
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 1 over Big Cedar Creek is a steel continuous stringer/multi-beam or girder carrying Ia 1 over Big Cedar Creek in Jefferson County, Iowa. It was built in 1967, so it is 58 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 2,730 vehicles a day, roughly 12% of them trucks, projected to reach 2,730 by 2044. The structure is 284 ft (86.6 m) long and 35 ft wide. If it were closed, the detour would be 47.8 mi (77 km).

Location

Open in Google Maps
CarriesIa 1
CrossesBig Cedar Creek
Location2.9 Mi. S of Jct. US 34
RouteState Highway 1
CountyJefferson County
StateIowa
Coordinates40.9443, -91.95135
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionJune 2024
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 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 rating56 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length284 ft (86.6 m)
Longest span109 ft (33.2 m)
Deck width35 ft (10.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,730 (2022)
Projected traffic2,730 by 2044
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.8 mi (77 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 1 over Big Cedar Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Ia 1 over Big Cedar 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 June 2024.

How much traffic does Ia 1 over Big Cedar Creek carry?

About 2,730 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is Ia 1 over Big Cedar Creek?

The structure is 284 ft (86.6 m) long with a longest span of 109 ft (33.2 m) and a deck 35 ft wide.

Who owns Ia 1 over Big Cedar Creek?

It is owned by the State Highway Agency.