US Bridges

Iron Avenue over Smoky Hill River

Fair

Saline County, Kansas · 3.4 E of I-135 · Structure no. 425400854832001

Built
1960
65 years old, rebuilt 1986
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
286 ft
3 main spans
Daily traffic
5,000
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Iron Avenue over Smoky Hill River is a steel continuous stringer/multi-beam or girder carrying Iron Avenue over Smoky Hill River in Saline County, Kansas. It was built in 1960 and reconstructed in 1986, so it is 65 years old, older than the Kansas average of 52.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,000 vehicles a day, roughly 1% of them trucks, projected to reach 5,000 by 2043. The structure is 286 ft (87.2 m) long and 61 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIron Avenue
CrossesSmoky Hill River
Location3.4 E of I-135
RouteCity Street 4832
StateKansas
Coordinates38.84038, -97.58223
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.3 US tons
Inventory rating49.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length286 ft (87.2 m)
Longest span110 ft (33.4 m)
Deck width61 ft (18.6 m)
Roadway width49 ft (15 m)
Vertical clearance over deck30 ft (9.1 m)

Traffic and service

Average daily traffic5,000 (2023)
Projected traffic5,000 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Iron Avenue over Smoky Hill River built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1986.

What condition is Iron Avenue over Smoky Hill River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does Iron Avenue over Smoky Hill River carry?

About 5,000 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Iron Avenue over Smoky Hill River?

The structure is 286 ft (87.2 m) long with a longest span of 110 ft (33.4 m) and a deck 61 ft wide.

Who owns Iron Avenue over Smoky Hill River?

It is owned by the City or Municipal Highway Agency.