US Bridges

SH 99 NB Ent Ramp over Big Ditch Canal

Good

Liberty County, Texas · 1.9 MI W HWY146 · Structure no. 201460351009291

Built
2019
6 years old
Condition
Good
inspected July 2024
Type
Slab
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
700
2017 count
Owner
State
State Highway Agency

About this bridge

SH 99 NB Ent Ramp over Big Ditch Canal is a prestressed concrete slab carrying SH 99 NB Ent Ramp over Big Ditch Canal in Liberty County, Texas. It was built in 2019, so it is 6 years old, younger 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 700 vehicles a day, roughly 10% of them trucks, projected to reach 2,000 by 2035. The structure is 50 ft (15.2 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSH 99 NB Ent Ramp
CrossesBig Ditch Canal
Location1.9 MI W HWY146
RouteState Highway 99
StateTexas
Coordinates29.95918, -94.93175
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length50 ft (15.2 m)
Longest span50 ft (15.2 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2017)
Projected traffic2,000 by 2035
Trucks10%
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 Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SH 99 NB Ent Ramp over Big Ditch Canal built?

It was built in 2019, making it 6 years old in 2025.

What condition is SH 99 NB Ent Ramp over Big Ditch Canal 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 July 2024.

How much traffic does SH 99 NB Ent Ramp over Big Ditch Canal carry?

About 700 vehicles per day (2017 count), of which roughly 10% are trucks.

How long is SH 99 NB Ent Ramp over Big Ditch Canal?

The structure is 50 ft (15.2 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.

Who owns SH 99 NB Ent Ramp over Big Ditch Canal?

It is owned by the State Highway Agency and maintained by the State Toll Authority.