US Bridges

SR E 18 over Iowa River

Good

Marshall County, Iowa · 085191103 · Structure no. 000000000244271

Built
2011
14 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
337 ft
3 main spans
Daily traffic
324
2022 count
Owner
County
County Highway Agency

About this bridge

SR E 18 over Iowa River is a prestressed concrete stringer/multi-beam or girder carrying SR E 18 over Iowa River in Marshall County, Iowa. It was built in 2011, so it is 14 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 324 vehicles a day, roughly 19% of them trucks, projected to reach 324 by 2044. The structure is 337 ft (102.7 m) long and 33 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesSR E 18
CrossesIowa River
Location085191103
RouteCounty Highway 0
CountyMarshall County
StateIowa
Coordinates42.18754, -93.03814
Functional classRural Major 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length337 ft (102.7 m)
Longest span122 ft (37.2 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic324 (2022)
Projected traffic324 by 2044
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR E 18 over Iowa River built?

It was built in 2011, making it 14 years old in 2025.

What condition is SR E 18 over Iowa River 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 November 2024.

How much traffic does SR E 18 over Iowa River carry?

About 324 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is SR E 18 over Iowa River?

The structure is 337 ft (102.7 m) long with a longest span of 122 ft (37.2 m) and a deck 33 ft wide.

Who owns SR E 18 over Iowa River?

It is owned by the County Highway Agency.