US Bridges

SB Ia 13 over Over Cc RR

Fair

Linn County, Iowa · 0.4 MI S of S Jct. SR E16 · Structure no. 000000000033665

Built
1973
52 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
204 ft
3 main spans
Daily traffic
3,600
2022 count
Owner
State
State Highway Agency

About this bridge

SB Ia 13 over Over Cc RR is a prestressed concrete stringer/multi-beam or girder carrying SB Ia 13 over Over Cc RR in Linn County, Iowa. It was built in 1973, so it is 52 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 3,600 vehicles a day, roughly 9% of them trucks, projected to reach 3,600 by 2043. The structure is 204 ft (62.2 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSB Ia 13
CrossesOver Cc RR
Location0.4 MI S of S Jct. SR E16
RouteState Highway 13
StateIowa
Coordinates42.1907, -91.53537
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating94.4 US tons
Inventory rating56.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length204 ft (62.2 m)
Longest span69 ft (21 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,600 (2022)
Projected traffic3,600 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SB Ia 13 over Over Cc RR built?

It was built in 1973, making it 52 years old in 2025.

What condition is SB Ia 13 over Over Cc RR 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 2023.

How much traffic does SB Ia 13 over Over Cc RR carry?

About 3,600 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is SB Ia 13 over Over Cc RR?

The structure is 204 ft (62.2 m) long with a longest span of 69 ft (21 m) and a deck 43 ft wide.

Who owns SB Ia 13 over Over Cc RR?

It is owned by the State Highway Agency.