US Bridges

Ia 21 over Cedar Creek

Fair

Keokuk County, Iowa · 1.1 Mi. N of Jct. Ia 92 · Structure no. 000000000032600

Built
1948
77 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
122 ft
1 main span
Daily traffic
1,880
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 21 over Cedar Creek is a steel stringer/multi-beam or girder carrying Ia 21 over Cedar Creek in Keokuk County, Iowa. It was built in 1948, so it is 77 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 1,880 vehicles a day, roughly 18% of them trucks, projected to reach 1,880 by 2044. The structure is 122 ft (37.2 m) long and 32 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
CarriesIa 21
CrossesCedar Creek
Location1.1 Mi. N of Jct. Ia 92
RouteState Highway 21
CountyKeokuk County
StateIowa
Coordinates41.35199, -92.35436
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.5 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 20
Structure length122 ft (37.2 m)
Longest span80 ft (24.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,880 (2022)
Projected traffic1,880 by 2044
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 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 21 over Cedar Creek built?

It was built in 1948, making it 77 years old in 2025.

What condition is Ia 21 over 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 August 2024.

How much traffic does Ia 21 over Cedar Creek carry?

About 1,880 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is Ia 21 over Cedar Creek?

The structure is 122 ft (37.2 m) long with a longest span of 80 ft (24.4 m) and a deck 32 ft wide.

Who owns Ia 21 over Cedar Creek?

It is owned by the State Highway Agency.