US Bridges

Loop 377 (bus 20) over IH 20

Fair

Mitchell County, Texas · 1.0 MI E of FM 1229 · Structure no. 081680000508093

Built
1962
63 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
400 ft
4 main spans
Daily traffic
480
2010 count
Owner
State
State Highway Agency

About this bridge

Loop 377 (bus 20) over IH 20 is a steel continuous stringer/multi-beam or girder carrying Loop 377 (bus 20) over IH 20 in Mitchell County, Texas. It was built in 1962, so it is 63 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 480 vehicles a day, roughly 10% of them trucks, projected to reach 670 by 2030. The structure is 400 ft (121.9 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesLoop 377 (bus 20)
CrossesIH 20
Location1.0 MI E of FM 1229
RouteState Highway 20
CountyMitchell County
StateTexas
Coordinates32.39303, -100.90703
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.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionMay 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 rating54 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length400 ft (121.9 m)
Longest span100 ft (30.5 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic480 (2010)
Projected traffic670 by 2030
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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 Loop 377 (bus 20) over IH 20 built?

It was built in 1962, making it 63 years old in 2025.

What condition is Loop 377 (bus 20) over IH 20 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 May 2023.

How much traffic does Loop 377 (bus 20) over IH 20 carry?

About 480 vehicles per day (2010 count), of which roughly 10% are trucks.

How long is Loop 377 (bus 20) over IH 20?

The structure is 400 ft (121.9 m) long with a longest span of 100 ft (30.5 m) and a deck 31 ft wide.

Who owns Loop 377 (bus 20) over IH 20?

It is owned by the State Highway Agency.