US Bridges

Loop 306 over Drainage Ditch

Good

Tom Green County, Texas · 2.00 MI E of US 67 · Structure no. 072260007708059

Built
1969
56 years old, rebuilt 1980
Condition
Good
inspected July 2024
Type
Culvert
Concrete
Length
33 ft
6 main spans
Daily traffic
35,960
2013 count
Owner
State
State Highway Agency

About this bridge

Loop 306 over Drainage Ditch is a concrete culvert carrying Loop 306 over Drainage Ditch in Tom Green County, Texas. It was built in 1969 and reconstructed in 1980, so it is 56 years old, older 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 35,960 vehicles a day, roughly 4% of them trucks, projected to reach 50,350 by 2033. The structure is 33 ft (10.1 m) long.

CarriesLoop 306
CrossesDrainage Ditch
Location2.00 MI E of US 67
RouteState Highway 306
StateTexas
Coordinates31.41779, -100.47764
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans6
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,960 (2013)
Projected traffic50,350 by 2033
Trucks4%
Lanes on structure10
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 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 Loop 306 over Drainage Ditch built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 1980.

What condition is Loop 306 over Drainage Ditch 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 July 2024.

How much traffic does Loop 306 over Drainage Ditch carry?

About 35,960 vehicles per day (2013 count), of which roughly 4% are trucks.

How long is Loop 306 over Drainage Ditch?

The structure is 33 ft (10.1 m) long with a longest span of 6 ft (1.8 m).

Who owns Loop 306 over Drainage Ditch?

It is owned by the State Highway Agency.