US Bridges

NB US 218 over Ia 92

Good

Washington County, Iowa · At Jct. of Ia 92 · Structure no. 000000000606400

Built
1996
29 years old
Condition
Good
inspected November 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
226 ft
3 main spans
Daily traffic
4,150
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 218 over Ia 92 is a prestressed concrete stringer/multi-beam or girder carrying NB US 218 over Ia 92 in Washington County, Iowa. It was built in 1996, so it is 29 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 4,150 vehicles a day, roughly 23% of them trucks, projected to reach 4,150 by 2042. The structure is 226 ft (68.9 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNB US 218
CrossesIa 92
LocationAt Jct. of Ia 92
RouteU.S. Route 218
CountyWashington County
StateIowa
Coordinates41.29111, -91.53353
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.4 US tons
Inventory rating41.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length226 ft (68.9 m)
Longest span106 ft (32.3 m)
Deck width52 ft (15.7 m)
Roadway width48 ft (14.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,150 (2022)
Projected traffic4,150 by 2042
Trucks23%
Lanes on structure3
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 NB US 218 over Ia 92 built?

It was built in 1996, making it 29 years old in 2025.

What condition is NB US 218 over Ia 92 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 2022.

How much traffic does NB US 218 over Ia 92 carry?

About 4,150 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is NB US 218 over Ia 92?

The structure is 226 ft (68.9 m) long with a longest span of 106 ft (32.3 m) and a deck 52 ft wide.

Who owns NB US 218 over Ia 92?

It is owned by the State Highway Agency.