US Bridges

FM 306 over Devils Hollow

Good

Comal County, Texas · 4.7 MI E of US 281 · Structure no. 150460310601004

Built
1991
34 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
115 ft
1 main span
Daily traffic
6,822
2020 count
Owner
State
State Highway Agency

About this bridge

FM 306 over Devils Hollow is a prestressed concrete stringer/multi-beam or girder carrying FM 306 over Devils Hollow in Comal County, Texas. It was built in 1991, so it is 34 years old, younger than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,822 vehicles a day, roughly 4% of them trucks, projected to reach 6,100 by 2033. The structure is 115 ft (35.1 m) long and 42 ft wide.

Location

Open in Google Maps
CarriesFM 306
CrossesDevils Hollow
Location4.7 MI E of US 281
RouteState Highway 306
CountyComal County
StateTexas
Coordinates29.94208, -98.33456
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length115 ft (35.1 m)
Longest span115 ft (35.1 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,822 (2020)
Projected traffic6,100 by 2033
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 306 over Devils Hollow built?

It was built in 1991, making it 34 years old in 2025.

What condition is FM 306 over Devils Hollow in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does FM 306 over Devils Hollow carry?

About 6,822 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is FM 306 over Devils Hollow?

The structure is 115 ft (35.1 m) long with a longest span of 115 ft (35.1 m) and a deck 42 ft wide.

Who owns FM 306 over Devils Hollow?

It is owned by the State Highway Agency.