FM 400 over US 87

Fair

Lynn County, Texas · 2.00 MI N of US 380 · Structure no. 051530006802010

Built: 1968; 57 years old
Condition: Fair; inspected November 2023
Type: Stringer/Multi-beam or Girder; Prestressed Concrete
Length: 250 ft; 2 main spans
Daily traffic: 1,140; 2013 count
Owner: State; State Highway Agency

About this bridge

FM 400 over US 87 is a prestressed concrete stringer/multi-beam or girder carrying FM 400 over US 87 in Lynn County, Texas. It was built in 1968, so it is 57 years old, older than the Texas average of 44.4 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 1,140 vehicles a day, roughly 18% of them trucks, projected to reach 1,600 by 2033. The structure is 250 ft (76.2 m) long and 46 ft wide.

Location

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CarriesFM 400

CrossesUS 87

Location2.00 MI N of US 380

RouteState Highway 400

CountyLynn County

StateTexas

Coordinates33.19498, -101.79598

Functional classRural Major Collector

Condition and inspection

Fair

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

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionNovember 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 geometry7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating60 US tons

Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder

MaterialPrestressed Concrete

DeckConcrete, cast-in-place

Main spans2 (+2 approach)

Design loadH 20

Structure length250 ft (76.2 m)

Longest span80 ft (24.4 m)

Deck width46 ft (14.1 m)

Roadway width43 ft (13.2 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,140 (2013)

Projected traffic1,600 by 2033

Trucks18%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesHighway

Detour if closed—

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency

Maintained byState Highway Agency

Historic statusPossibly eligible for the National Register; requires further investigation

Work proposedNone recorded

Estimated improvement cost—

NavigationNot applicable (no waterway)

Frequently asked questions

When was FM 400 over US 87 built?

It was built in 1968, making it 57 years old in 2025.

What condition is FM 400 over US 87 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 November 2023.

How much traffic does FM 400 over US 87 carry?

About 1,140 vehicles per day (2013 count), of which roughly 18% are trucks.

How long is FM 400 over US 87?

The structure is 250 ft (76.2 m) long with a longest span of 80 ft (24.4 m) and a deck 46 ft wide.

Who owns FM 400 over US 87?

It is owned by the State Highway Agency.