US Bridges

IH 35 Ml over Blanco River

Fair

Hays County, Texas · 1.6 MI N of Lp 82 · Structure no. 141060001602201

Built
1935
90 years old, rebuilt 1993
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
746 ft
3 main spans
Daily traffic
127,801
2023 count
Owner
State
State Highway Agency

About this bridge

IH 35 Ml over Blanco River is a prestressed concrete stringer/multi-beam or girder carrying IH 35 Ml over Blanco River in Hays County, Texas. It was built in 1935 and reconstructed in 1993, so it is 90 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 127,801 vehicles a day, roughly 17% of them trucks, projected to reach 224,930 by 2042. The structure is 746 ft (227.4 m) long and 117 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIH 35 Ml
CrossesBlanco River
Location1.6 MI N of Lp 82
RouteInterstate 35
StateTexas
Coordinates29.91235, -97.89821
Functional classUrban Principal Arterial - Interstate

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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+9 approach)
Design loadHS 20
Structure length746 ft (227.4 m)
Longest span100 ft (30.5 m)
Deck width117 ft (35.7 m)
Roadway width112 ft (34.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic127,801 (2023)
Projected traffic224,930 by 2042
Trucks17%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$106,000
NavigationNo navigation control on waterway

Frequently asked questions

When was IH 35 Ml over Blanco River built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1993.

What condition is IH 35 Ml 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 August 2024.

How much traffic does IH 35 Ml over Blanco River carry?

About 127,801 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is IH 35 Ml over Blanco River?

The structure is 746 ft (227.4 m) long with a longest span of 100 ft (30.5 m) and a deck 117 ft wide.

Who owns IH 35 Ml over Blanco River?

It is owned by the State Highway Agency.