US Bridges

US 377 over North Llano River

Fair

Kimble County, Texas · 0.50 MI S of IH 10 · Structure no. 071340014120034

Built
1933
92 years old, rebuilt 1988
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
678 ft
2 main spans
Daily traffic
4,694
2023 count
Owner
State
State Highway Agency

About this bridge

US 377 over North Llano River is a prestressed concrete stringer/multi-beam or girder carrying US 377 over North Llano River in Kimble County, Texas. It was built in 1933 and reconstructed in 1988, so it is 92 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 4,694 vehicles a day, roughly 21% of them trucks, projected to reach 6,760 by 2033. The structure is 678 ft (206.7 m) long and 60 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesUS 377
CrossesNorth Llano River
Location0.50 MI S of IH 10
RouteU.S. Route 377
CountyKimble County
StateTexas
Coordinates30.50302, -99.77826
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+9 approach)
Design loadH 15
Structure length678 ft (206.7 m)
Longest span132 ft (40.2 m)
Deck width60 ft (18.3 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,694 (2023)
Projected traffic6,760 by 2033
Trucks21%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 377 over North Llano River built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1988.

What condition is US 377 over North Llano River 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 2024.

How much traffic does US 377 over North Llano River carry?

About 4,694 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is US 377 over North Llano River?

The structure is 678 ft (206.7 m) long with a longest span of 132 ft (40.2 m) and a deck 60 ft wide.

Who owns US 377 over North Llano River?

It is owned by the State Highway Agency.