US Bridges

Loop 337 NB over Union Pacific Railroad

Fair

Comal County, Texas · 0.6 MI N of IH 35 · Structure no. 150460021601021

Built
1971
54 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
260 ft
3 main spans
Daily traffic
28,615
2023 count
Owner
State
State Highway Agency

About this bridge

Loop 337 NB over Union Pacific Railroad is a prestressed concrete stringer/multi-beam or girder carrying Loop 337 NB over Union Pacific Railroad in Comal County, Texas. It was built in 1971, so it is 54 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 28,615 vehicles a day, roughly 4% of them trucks, projected to reach 25,250 by 2033. The structure is 260 ft (79.2 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesLoop 337 NB
CrossesUnion Pacific Railroad
Location0.6 MI N of IH 35
RouteState Highway 337
CountyComal County
StateTexas
Coordinates29.68247, -98.1549
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
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 rating72 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length260 ft (79.2 m)
Longest span90 ft (27.4 m)
Deck width50 ft (15.3 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,615 (2023)
Projected traffic25,250 by 2033
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
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 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 337 NB over Union Pacific Railroad built?

It was built in 1971, making it 54 years old in 2025.

What condition is Loop 337 NB over Union Pacific Railroad 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 June 2024.

How much traffic does Loop 337 NB over Union Pacific Railroad carry?

About 28,615 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Loop 337 NB over Union Pacific Railroad?

The structure is 260 ft (79.2 m) long with a longest span of 90 ft (27.4 m) and a deck 50 ft wide.

Who owns Loop 337 NB over Union Pacific Railroad?

It is owned by the State Highway Agency.