US Bridges

Mill Street over I-70 Railroad Yard

Fair

Wyandotte County, Kansas · Mill Street Viaduct · Structure no. 514301050000143

Built
1964
61 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,466 ft
11 main spans
Daily traffic
5,824
1992 count
Owner
County
County Highway Agency

About this bridge

Mill Street over I-70 Railroad Yard is a steel continuous stringer/multi-beam or girder carrying Mill Street over I-70 Railroad Yard in Wyandotte County, Kansas. It was built in 1964, so it is 61 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 5 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 5,824 vehicles a day, roughly 1% of them trucks, projected to reach 6,500 by 2043. The structure is 1,466 ft (446.8 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMill Street
CrossesI-70 Railroad Yard
LocationMill Street Viaduct
RouteCity Street 0
CountyWyandotte County
StateKansas
Coordinates39.09021, -94.63067
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.8 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans11 (+12 approach)
Design loadH 20
Structure length1,466 ft (446.8 m)
Longest span109 ft (33.2 m)
Deck width32 ft (9.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck30 ft (9.1 m)

Traffic and service

Average daily traffic5,824 (1992)
Projected traffic6,500 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed1.2 mi (2 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$15,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mill Street over I-70 Railroad Yard built?

It was built in 1964, making it 61 years old in 2025.

What condition is Mill Street over I-70 Railroad Yard 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 March 2023.

How much traffic does Mill Street over I-70 Railroad Yard carry?

About 5,824 vehicles per day (1992 count), of which roughly 1% are trucks.

How long is Mill Street over I-70 Railroad Yard?

The structure is 1,466 ft (446.8 m) long with a longest span of 109 ft (33.2 m) and a deck 32 ft wide.

Who owns Mill Street over I-70 Railroad Yard?

It is owned by the County Highway Agency.