US Bridges

Summit ST over Over Iais RR

Good

Johnson County, Iowa · 079061400 · Structure no. 000000000006491

Built
1999
26 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
171 ft
3 main spans
Daily traffic
4,651
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Summit ST over Over Iais RR is a steel continuous stringer/multi-beam or girder carrying Summit ST over Over Iais RR in Johnson County, Iowa. It was built in 1999, so it is 26 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 4,651 vehicles a day, projected to reach 4,651 by 2043. The structure is 171 ft (52.1 m) long and 48 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSummit ST
CrossesOver Iais RR
Location079061400
RouteCity Street 0
CountyJohnson County
StateIowa
Coordinates41.65101, -91.52103
Functional classUrban Collector

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating62.4 US tons
Inventory rating37.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length171 ft (52.1 m)
Longest span65 ft (19.8 m)
Deck width48 ft (14.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,651 (2022)
Projected traffic4,651 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byRailroad
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$17,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Summit ST over Over Iais RR built?

It was built in 1999, making it 26 years old in 2025.

What condition is Summit ST over Over Iais 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 July 2023.

How much traffic does Summit ST over Over Iais RR carry?

About 4,651 vehicles per day (2022 count).

How long is Summit ST over Over Iais RR?

The structure is 171 ft (52.1 m) long with a longest span of 65 ft (19.8 m) and a deck 48 ft wide.

Who owns Summit ST over Over Iais RR?

It is owned by the City or Municipal Highway Agency and maintained by the Railroad.