US Bridges

Is 29 N over High CR

Fair

Atchison County, Missouri · S 24 T 66 N R 42 W · Structure no. 2049

Built
1971
54 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
268 ft
5 main spans
Daily traffic
7,009
2024 count
Owner
State
State Highway Agency

About this bridge

Is 29 N over High CR is a prestressed concrete continuous stringer/multi-beam or girder carrying Is 29 N over High CR in Atchison County, Missouri. It was built in 1971, so it is 54 years old, older than the Missouri average of 45.1 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 7,009 vehicles a day, roughly 43% of them trucks, projected to reach 14,719 by 2044. The structure is 268 ft (81.7 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesIs 29 N
CrossesHigh CR
LocationS 24 T 66 N R 42 W
RouteInterstate 29
Coordinates40.51236, -95.60191
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating34.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length268 ft (81.7 m)
Longest span59 ft (18 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,009 (2024)
Projected traffic14,719 by 2044
Trucks43%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Is 29 N over High CR built?

It was built in 1971, making it 54 years old in 2025.

What condition is Is 29 N over High CR 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 September 2023.

How much traffic does Is 29 N over High CR carry?

About 7,009 vehicles per day (2024 count), of which roughly 43% are trucks.

How long is Is 29 N over High CR?

The structure is 268 ft (81.7 m) long with a longest span of 59 ft (18 m) and a deck 41 ft wide.

Who owns Is 29 N over High CR?

It is owned by the State Highway Agency.