US Bridges

IH 45 NB over SH 6 & SH 146

Fair

Galveston County, Texas · @tex.City Y-Intersection · Structure no. 120850050004221

Built
1951
74 years old, rebuilt 1965
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
152 ft
1 main span
Daily traffic
22,730
2013 count
Owner
State
State Highway Agency

About this bridge

IH 45 NB over SH 6 & SH 146 is a steel continuous stringer/multi-beam or girder carrying IH 45 NB over SH 6 & SH 146 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 22,730 vehicles a day, roughly 4% of them trucks, projected to reach 31,830 by 2033. The structure is 152 ft (46.3 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIH 45 NB
CrossesSH 6 & SH 146
Location@tex.City Y-Intersection
RouteInterstate 45
CountyGalveston County
StateTexas
Coordinates29.33083, -94.93336
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 rating53 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length152 ft (46.3 m)
Longest span60 ft (18.3 m)
Deck width54 ft (16.5 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,730 (2013)
Projected traffic31,830 by 2033
Trucks4%
Lanes on structure3
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$18,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 45 NB over SH 6 & SH 146 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 6 & SH 146 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 6 & SH 146 carry?

About 22,730 vehicles per day (2013 count), of which roughly 4% are trucks.

How long is IH 45 NB over SH 6 & SH 146?

The structure is 152 ft (46.3 m) long with a longest span of 60 ft (18.3 m) and a deck 54 ft wide.

Who owns IH 45 NB over SH 6 & SH 146?

It is owned by the State Highway Agency.