US Bridges

IH 45 over Trib of Alligator CR

Good

Montgomery County, Texas · 0.30 MI N of SH 105 · Structure no. 121700067508070

Built
1962
63 years old, rebuilt 2012
Condition
Good
inspected September 2024
Type
Culvert
Concrete
Length
28 ft
4 main spans
Daily traffic
125,607
2023 count
Owner
State
State Highway Agency

About this bridge

IH 45 over Trib of Alligator CR is a concrete culvert carrying IH 45 over Trib of Alligator CR in Montgomery County, Texas. It was built in 1962 and reconstructed in 2012, so it is 63 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 125,607 vehicles a day, roughly 13% of them trucks, projected to reach 228,605 by 2042. The structure is 28 ft (8.5 m) long.

Location

Open in Google Maps
CarriesIH 45
CrossesTrib of Alligator CR
Location0.30 MI N of SH 105
RouteInterstate 45
CountyMontgomery County
StateTexas
Coordinates30.31945, -95.47306
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadOther
Structure length28 ft (8.5 m)
Longest span7 ft (2.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125,607 (2023)
Projected traffic228,605 by 2042
Trucks13%
Lanes on structure15
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IH 45 over Trib of Alligator CR built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2012.

What condition is IH 45 over Trib of Alligator CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does IH 45 over Trib of Alligator CR carry?

About 125,607 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is IH 45 over Trib of Alligator CR?

The structure is 28 ft (8.5 m) long with a longest span of 7 ft (2.1 m).

Who owns IH 45 over Trib of Alligator CR?

It is owned by the State Highway Agency.