US Bridges

Ia 92 over Rock Creek

Fair

Keokuk County, Iowa · 0.4 Mi. W of Jct. SR V45 · Structure no. 000000000032720

Built
1964
61 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete Continuous
Length
127 ft
3 main spans
Daily traffic
3,400
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 92 over Rock Creek is a concrete continuous slab carrying Ia 92 over Rock Creek in Keokuk County, Iowa. It was built in 1964, so it is 61 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 3,400 vehicles a day, roughly 9% of them trucks, projected to reach 3,400 by 2043. The structure is 127 ft (38.7 m) long and 36 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
CarriesIa 92
CrossesRock Creek
Location0.4 Mi. W of Jct. SR V45
RouteState Highway 92
CountyKeokuk County
StateIowa
Coordinates41.33673, -92.22261
Functional classRural Principal Arterial - Other

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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating41.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length127 ft (38.7 m)
Longest span48 ft (14.6 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,400 (2023)
Projected traffic3,400 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 km)
TollOn a free road
National Highway SystemYes

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 92 over Rock Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is Ia 92 over Rock 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 2023.

How much traffic does Ia 92 over Rock Creek carry?

About 3,400 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Ia 92 over Rock Creek?

The structure is 127 ft (38.7 m) long with a longest span of 48 ft (14.6 m) and a deck 36 ft wide.

Who owns Ia 92 over Rock Creek?

It is owned by the State Highway Agency.