US Bridges

C33 over Shell Rock River

Fair

Butler County, Iowa · 092161301 · Structure no. 000000000088520

Built
1957
68 years old, rebuilt 1996
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
448 ft
5 main spans
Daily traffic
805
2022 count
Owner
County
County Highway Agency

About this bridge

C33 over Shell Rock River is a steel continuous stringer/multi-beam or girder carrying C33 over Shell Rock River in Butler County, Iowa. It was built in 1957 and reconstructed in 1996, so it is 68 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 805 vehicles a day, roughly 11% of them trucks, projected to reach 805 by 2044. The structure is 448 ft (136.6 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesC33
CrossesShell Rock River
Location092161301
RouteCounty Highway 0
CountyButler County
StateIowa
Coordinates42.78828, -92.68921
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.8 US tons
Inventory rating25.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length448 ft (136.6 m)
Longest span97 ft (29.6 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic805 (2022)
Projected traffic805 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$4.6 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was C33 over Shell Rock River built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1996.

What condition is C33 over Shell Rock 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 April 2024.

How much traffic does C33 over Shell Rock River carry?

About 805 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is C33 over Shell Rock River?

The structure is 448 ft (136.6 m) long with a longest span of 97 ft (29.6 m) and a deck 33 ft wide.

Who owns C33 over Shell Rock River?

It is owned by the County Highway Agency.