US Bridges

Bi 20 over At and Sf RR Walnut ST

Fair

Nolan County, Texas · 0.35 MI SW of SH 70 Bus · Structure no. 081770000615009

Built
1935
90 years old, rebuilt 2008
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
657 ft
3 main spans
Daily traffic
4,700
2013 count
Owner
State
State Highway Agency

About this bridge

Bi 20 over At and Sf RR Walnut ST is a steel continuous stringer/multi-beam or girder carrying Bi 20 over At and Sf RR Walnut ST in Nolan County, Texas. It was built in 1935 and reconstructed in 2008, so it is 90 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 5 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 4,700 vehicles a day, roughly 28% of them trucks, projected to reach 6,590 by 2033. The structure is 657 ft (200.3 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesBi 20
CrossesAt and Sf RR Walnut ST
Location0.35 MI SW of SH 70 Bus
RouteState Highway 20
CountyNolan County
StateTexas
Coordinates32.46846, -100.4119
Functional classUrban Other Principal Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+13 approach)
Design loadH 15
Structure length657 ft (200.3 m)
Longest span80 ft (24.4 m)
Deck width47 ft (14.4 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,700 (2013)
Projected traffic6,590 by 2033
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Bi 20 over At and Sf RR Walnut ST built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 2008.

What condition is Bi 20 over At and Sf RR Walnut ST 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 March 2023.

How much traffic does Bi 20 over At and Sf RR Walnut ST carry?

About 4,700 vehicles per day (2013 count), of which roughly 28% are trucks.

How long is Bi 20 over At and Sf RR Walnut ST?

The structure is 657 ft (200.3 m) long with a longest span of 80 ft (24.4 m) and a deck 47 ft wide.

Who owns Bi 20 over At and Sf RR Walnut ST?

It is owned by the State Highway Agency.