US Bridges

Lyman RD over Long Br

Good

Linn County, Missouri · S 3 T 58 N R 18 W · Structure no. 24457

Built
1990
35 years old
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
30
2024 count
Owner
County
County Highway Agency

About this bridge

Lyman RD over Long Br is a concrete culvert carrying Lyman RD over Long Br in Linn County, Missouri. It was built in 1990, so it is 35 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 30 vehicles a day, roughly 10% of them trucks, projected to reach 33 by 2044. The structure is 26 ft (7.9 m) long and 29 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesLyman RD
CrossesLong Br
LocationS 3 T 58 N R 18 W
RouteCounty Highway 495
Coordinates39.8657, -92.9072
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating64.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span11 ft (3.4 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2024)
Projected traffic33 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Lyman RD over Long Br built?

It was built in 1990, making it 35 years old in 2025.

What condition is Lyman RD over Long Br 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 November 2024.

How much traffic does Lyman RD over Long Br carry?

About 30 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Lyman RD over Long Br?

The structure is 26 ft (7.9 m) long with a longest span of 11 ft (3.4 m) and a deck 29 ft wide.

Who owns Lyman RD over Long Br?

It is owned by the County Highway Agency.