US Bridges

IH 45 NB over SH 146 SB

Fair

Galveston County, Texas · @tex. City Y-Intersection · Structure no. 120850050004219

Built
1951
74 years old, rebuilt 1965
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
217 ft
3 main spans
Daily traffic
33,950
2013 count
Owner
State
State Highway Agency

About this bridge

IH 45 NB over SH 146 SB is a steel continuous stringer/multi-beam or girder carrying IH 45 NB over SH 146 SB in Galveston County, Texas. It was built in 1951 and reconstructed in 1965, so it is 74 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 5 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 33,950 vehicles a day, roughly 4% of them trucks, projected to reach 47,540 by 2033. The structure is 217 ft (66.1 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIH 45 NB
CrossesSH 146 SB
Location@tex. City Y-Intersection
RouteInterstate 45
CountyGalveston County
StateTexas
Coordinates29.32931, -94.93146
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length217 ft (66.1 m)
Longest span85 ft (25.9 m)
Deck width66 ft (20.1 m)
Roadway width61 ft (18.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,950 (2013)
Projected traffic47,540 by 2033
Trucks4%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$33,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 45 NB over SH 146 SB built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1965.

What condition is IH 45 NB over SH 146 SB 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 IH 45 NB over SH 146 SB carry?

About 33,950 vehicles per day (2013 count), of which roughly 4% are trucks.

How long is IH 45 NB over SH 146 SB?

The structure is 217 ft (66.1 m) long with a longest span of 85 ft (25.9 m) and a deck 66 ft wide.

Who owns IH 45 NB over SH 146 SB?

It is owned by the State Highway Agency.