US Bridges

RM 12 over Blanco River

Fair

Hays County, Texas · 0.2 MI S of RM 3237 · Structure no. 141060028503003

Built
1959
66 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
440 ft
4 main spans
Daily traffic
13,655
2023 count
Owner
State
State Highway Agency

About this bridge

RM 12 over Blanco River is a prestressed concrete stringer/multi-beam or girder carrying RM 12 over Blanco River in Hays County, Texas. It was built in 1959, so it is 66 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 13,655 vehicles a day, roughly 5% of them trucks, projected to reach 13,830 by 2033. The structure is 440 ft (134.1 m) long and 32 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesRM 12
CrossesBlanco River
Location0.2 MI S of RM 3237
RouteState Highway 12
CountyHays County
StateTexas
Coordinates29.9935, -98.08856
Functional classUrban Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4 (+5 approach)
Design loadH 20
Structure length440 ft (134.1 m)
Longest span60 ft (18.3 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,655 (2023)
Projected traffic13,830 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 SystemNo

Ownership and planned work

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

Frequently asked questions

When was RM 12 over Blanco River built?

It was built in 1959, making it 66 years old in 2025.

What condition is RM 12 over Blanco 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 September 2024.

How much traffic does RM 12 over Blanco River carry?

About 13,655 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is RM 12 over Blanco River?

The structure is 440 ft (134.1 m) long with a longest span of 60 ft (18.3 m) and a deck 32 ft wide.

Who owns RM 12 over Blanco River?

It is owned by the State Highway Agency.