US Bridges

FM 306 over Guadalupe River

Fair

Comal County, Texas · 12.4 MI W of IH 35 · Structure no. 150460172802005

Built
1962
63 years old, rebuilt 1980
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
210 ft
8 main spans
Daily traffic
8,716
2020 count
Owner
State
State Highway Agency

About this bridge

FM 306 over Guadalupe River is a concrete continuous slab carrying FM 306 over Guadalupe River in Comal County, Texas. It was built in 1962 and reconstructed in 1980, 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 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 8,716 vehicles a day, roughly 5% of them trucks, projected to reach 10,060 by 2033. The structure is 210 ft (64 m) long and 40 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesFM 306
CrossesGuadalupe River
Location12.4 MI W of IH 35
RouteState Highway 306
CountyComal County
StateTexas
Coordinates29.86453, -98.16381
Functional classRural Principal Arterial - Other

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadOther
Structure length210 ft (64 m)
Longest span30 ft (9.1 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,716 (2020)
Projected traffic10,060 by 2033
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 306 over Guadalupe River built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1980.

What condition is FM 306 over Guadalupe 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 June 2024.

How much traffic does FM 306 over Guadalupe River carry?

About 8,716 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is FM 306 over Guadalupe River?

The structure is 210 ft (64 m) long with a longest span of 30 ft (9.1 m) and a deck 40 ft wide.

Who owns FM 306 over Guadalupe River?

It is owned by the State Highway Agency.