US Bridges

IH 45 SB over Spring Branch

Fair

Leon County, Texas · 2.65 MI S of FM 977 · Structure no. 171450067504101

Built
1965
60 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
91 ft
3 main spans
Daily traffic
18,262
2019 count
Owner
State
State Highway Agency

About this bridge

IH 45 SB over Spring Branch is a concrete stringer/multi-beam or girder carrying IH 45 SB over Spring Branch in Leon County, Texas. It was built in 1965, so it is 60 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 18,262 vehicles a day, roughly 30% of them trucks, projected to reach 18,150 by 2033. The structure is 91 ft (27.7 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIH 45 SB
CrossesSpring Branch
Location2.65 MI S of FM 977
RouteInterstate 45
CountyLeon County
StateTexas
Coordinates31.11306, -95.97033
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating72 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span30 ft (9.1 m)
Deck width42 ft (12.7 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,262 (2019)
Projected traffic18,150 by 2033
Trucks30%
Lanes on structure2
Traffic directionOne-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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IH 45 SB over Spring Branch built?

It was built in 1965, making it 60 years old in 2025.

What condition is IH 45 SB over Spring Branch 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 March 2023.

How much traffic does IH 45 SB over Spring Branch carry?

About 18,262 vehicles per day (2019 count), of which roughly 30% are trucks.

How long is IH 45 SB over Spring Branch?

The structure is 91 ft (27.7 m) long with a longest span of 30 ft (9.1 m) and a deck 42 ft wide.

Who owns IH 45 SB over Spring Branch?

It is owned by the State Highway Agency.