US Bridges

Spring ST over Shell Rock River

Fair

Cerro Gordo County, Iowa · 000000000 · Structure no. 000000000009970

Built
1929
96 years old
Condition
Fair
inspected January 2024
Type
Arch - Deck
Concrete
Length
142 ft
1 main span
Daily traffic
919
2022 count
Owner
County
County Highway Agency

About this bridge

Spring ST over Shell Rock River is a concrete arch - deck carrying Spring ST over Shell Rock River in Cerro Gordo County, Iowa. It was built in 1929, so it is 96 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 919 vehicles a day, projected to reach 919 by 2044. The structure is 142 ft (43.3 m) long and 28 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesSpring ST
CrossesShell Rock River
Location000000000
RouteCity Street 0
CountyCerro Gordo County
StateIowa
Coordinates43.20652, -93.08446
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42 US tons
Inventory rating25.2 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length142 ft (43.3 m)
Longest span140 ft (42.7 m)
Deck width28 ft (8.5 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic919 (2022)
Projected traffic919 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Spring ST over Shell Rock River built?

It was built in 1929, making it 96 years old in 2025.

What condition is Spring ST 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 January 2024.

How much traffic does Spring ST over Shell Rock River carry?

About 919 vehicles per day (2022 count).

How long is Spring ST over Shell Rock River?

The structure is 142 ft (43.3 m) long with a longest span of 140 ft (42.7 m) and a deck 28 ft wide.

Who owns Spring ST over Shell Rock River?

It is owned by the County Highway Agency.