US Bridges

Ia 100 EB over Old Ferry RD

Good

Linn County, Iowa · 1.0 MI NW of JCT CR W36 · Structure no. 000000000700435

Built
2016
9 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
239 ft
3 main spans
Daily traffic
5,750
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 100 EB over Old Ferry RD is a prestressed concrete stringer/multi-beam or girder carrying Ia 100 EB over Old Ferry RD in Linn County, Iowa. It was built in 2016, so it is 9 years old, younger 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 5,750 vehicles a day, roughly 3% of them trucks, projected to reach 5,750 by 2043. The structure is 239 ft (72.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIa 100 EB
CrossesOld Ferry RD
Location1.0 MI NW of JCT CR W36
RouteState Highway 100
StateIowa
Coordinates42.01838, -91.75565
Functional classUrban Other Principal Arterial

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.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 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 alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length239 ft (72.8 m)
Longest span81 ft (24.8 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,750 (2022)
Projected traffic5,750 by 2043
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 Ia 100 EB over Old Ferry RD built?

It was built in 2016, making it 9 years old in 2025.

What condition is Ia 100 EB over Old Ferry RD 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 September 2023.

How much traffic does Ia 100 EB over Old Ferry RD carry?

About 5,750 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Ia 100 EB over Old Ferry RD?

The structure is 239 ft (72.8 m) long with a longest span of 81 ft (24.8 m) and a deck 43 ft wide.

Who owns Ia 100 EB over Old Ferry RD?

It is owned by the State Highway Agency.