US Bridges

Bus 77 SB over Drainage Ditch

Good

Cameron County, Texas · 0.01 MI S of FM 732 · Structure no. 210310003912034

Built
1950
75 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete
Length
50 ft
2 main spans
Daily traffic
4,913
2024 count
Owner
State
State Highway Agency

About this bridge

Bus 77 SB over Drainage Ditch is a concrete slab carrying Bus 77 SB over Drainage Ditch in Cameron County, Texas. It was built in 1950, so it is 75 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 4,913 vehicles a day, roughly 1% of them trucks, projected to reach 4,790 by 2033. The structure is 50 ft (15.2 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesBus 77 SB
CrossesDrainage Ditch
Location0.01 MI S of FM 732
RouteState Highway 77
StateTexas
Coordinates26.11179, -97.60618
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour evaluation has not been made
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length50 ft (15.2 m)
Longest span25 ft (7.6 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,913 (2024)
Projected traffic4,790 by 2033
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Bus 77 SB over Drainage Ditch built?

It was built in 1950, making it 75 years old in 2025.

What condition is Bus 77 SB over Drainage Ditch 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 March 2023.

How much traffic does Bus 77 SB over Drainage Ditch carry?

About 4,913 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Bus 77 SB over Drainage Ditch?

The structure is 50 ft (15.2 m) long with a longest span of 25 ft (7.6 m) and a deck 40 ft wide.

Who owns Bus 77 SB over Drainage Ditch?

It is owned by the State Highway Agency.