US Bridges

NB Ia 13 over Over Cc RR

Good

Linn County, Iowa · 0.4 Mi. S of SR E16 · Structure no. 000000000033661

Built
1973
52 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
205 ft
3 main spans
Daily traffic
3,600
2022 count
Owner
State
State Highway Agency

About this bridge

NB Ia 13 over Over Cc RR is a prestressed concrete stringer/multi-beam or girder carrying NB 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,600 vehicles a day, roughly 9% of them trucks, projected to reach 3,600 by 2044. The structure is 205 ft (62.5 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNB Ia 13
CrossesOver Cc RR
Location0.4 Mi. S of SR E16
RouteState Highway 13
StateIowa
Coordinates42.19011, -91.53551
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
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 rating90.7 US tons
Inventory rating34.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length205 ft (62.5 m)
Longest span69 ft (21 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,600 (2022)
Projected traffic3,600 by 2044
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 NB Ia 13 over Over Cc RR built?

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

What condition is NB Ia 13 over Over Cc RR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

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

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

How long is NB Ia 13 over Over Cc RR?

The structure is 205 ft (62.5 m) long with a longest span of 69 ft (21 m) and a deck 43 ft wide.

Who owns NB Ia 13 over Over Cc RR?

It is owned by the State Highway Agency.