US Bridges

Outer RD I29 over Rock CR

GoodPosted for load

Atchison County, Missouri · S 9 T 64 N R 41 W · Structure no. 24793

Built
1937
88 years old
Condition
Good
inspected February 2024
Type
Girder and Floorbeam System
Steel
Length
253 ft
1 main span
Daily traffic
35
2024 count
Owner
County
County Highway Agency

About this bridge

Outer RD I29 over Rock CR is a steel girder and floorbeam system carrying Outer RD I29 over Rock CR in Atchison County, Missouri. It was built in 1937, so it is 88 years old, older than the Missouri average of 45.1 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. Its operating status is: posted for load restriction.

It carries about 35 vehicles a day, roughly 10% of them trucks, projected to reach 40 by 2044. The structure is 253 ft (77.1 m) long and 21 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesOuter RD I29
CrossesRock CR
LocationS 9 T 64 N R 41 W
RouteCounty Highway 554
CountyAtchison County
StateMissouri
Coordinates40.36693, -95.5254
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.8 US tons
Inventory rating12.9 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+3 approach)
Design loadOther
Structure length253 ft (77.1 m)
Longest span103 ft (31.4 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2024)
Projected traffic40 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Outer RD I29 over Rock CR built?

It was built in 1937, making it 88 years old in 2025.

What condition is Outer RD I29 over Rock CR 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 February 2024.

How much traffic does Outer RD I29 over Rock CR carry?

About 35 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Outer RD I29 over Rock CR?

The structure is 253 ft (77.1 m) long with a longest span of 103 ft (31.4 m) and a deck 21 ft wide.

Who owns Outer RD I29 over Rock CR?

It is owned by the County Highway Agency.