US Bridges

IH 35 SB over 18th ST

Fair

McLennan County, Texas · 3.1 MI NE of SH 6 · Structure no. 091610001501261

Built
1965
60 years old, rebuilt 1991
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
212 ft
4 main spans
Daily traffic
72,009
2017 count
Owner
State
State Highway Agency

About this bridge

IH 35 SB over 18th ST is a concrete continuous tee beam carrying IH 35 SB over 18th ST in McLennan County, Texas. It was built in 1965 and reconstructed in 1991, 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 72,009 vehicles a day, roughly 21% of them trucks, projected to reach 94,540 by 2037. The structure is 212 ft (64.6 m) long and 59 ft wide.

Location

Open in Google Maps
CarriesIH 35 SB
Crosses18th ST
Location3.1 MI NE of SH 6
RouteInterstate 35
CountyMcLennan County
StateTexas
Coordinates31.53486, -97.13
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length212 ft (64.6 m)
Longest span77 ft (23.5 m)
Deck width59 ft (17.9 m)
Roadway width57 ft (17.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic72,009 (2017)
Projected traffic94,540 by 2037
Trucks21%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 35 SB over 18th ST built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1991.

What condition is IH 35 SB over 18th ST 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 35 SB over 18th ST carry?

About 72,009 vehicles per day (2017 count), of which roughly 21% are trucks.

How long is IH 35 SB over 18th ST?

The structure is 212 ft (64.6 m) long with a longest span of 77 ft (23.5 m) and a deck 59 ft wide.

Who owns IH 35 SB over 18th ST?

It is owned by the State Highway Agency.