US Bridges

County RD 977 over Br of Mayes CR

Good

Audrain County, Missouri · S 29 T 51 N R 10 W · Structure no. 28205

Built
1997
28 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
48 ft
1 main span
Daily traffic
35
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 977 over Br of Mayes CR is a steel stringer/multi-beam or girder carrying County RD 977 over Br of Mayes CR in Audrain County, Missouri. It was built in 1997, so it is 28 years old, younger 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.

It carries about 35 vehicles a day, roughly 10% of them trucks, projected to reach 44 by 2043. The structure is 48 ft (14.6 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCounty RD 977
CrossesBr of Mayes CR
LocationS 29 T 51 N R 10 W
RouteCounty Highway 658
CountyAudrain County
StateMissouri
Coordinates39.16872, -92.06411
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 protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating65.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length48 ft (14.6 m)
Longest span45 ft (13.7 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2023)
Projected traffic44 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 977 over Br of Mayes CR built?

It was built in 1997, making it 28 years old in 2025.

What condition is County RD 977 over Br of Mayes 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 April 2023.

How much traffic does County RD 977 over Br of Mayes CR carry?

About 35 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 977 over Br of Mayes CR?

The structure is 48 ft (14.6 m) long with a longest span of 45 ft (13.7 m) and a deck 24 ft wide.

Who owns County RD 977 over Br of Mayes CR?

It is owned by the County Highway Agency.