US Bridges

FM 493 over Drainage Ditch

Good

Hidalgo County, Texas · 0.50 MI S of SH 186 · Structure no. 211090086303008

Built
1975
50 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
91 ft
2 main spans
Daily traffic
1,051
2024 count
Owner
State
State Highway Agency

About this bridge

FM 493 over Drainage Ditch is a prestressed concrete box beam or girders - multiple carrying FM 493 over Drainage Ditch in Hidalgo County, Texas. It was built in 1975, so it is 50 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,051 vehicles a day, roughly 5% of them trucks, projected to reach 1,050 by 2033. The structure is 91 ft (27.7 m) long and 36 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesFM 493
CrossesDrainage Ditch
Location0.50 MI S of SH 186
RouteState Highway 493
StateTexas
Coordinates26.48567, -98.00589
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to 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

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span45 ft (13.7 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,051 (2024)
Projected traffic1,050 by 2033
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

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 FM 493 over Drainage Ditch built?

It was built in 1975, making it 50 years old in 2025.

What condition is FM 493 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 May 2023.

How much traffic does FM 493 over Drainage Ditch carry?

About 1,051 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is FM 493 over Drainage Ditch?

The structure is 91 ft (27.7 m) long with a longest span of 45 ft (13.7 m) and a deck 36 ft wide.

Who owns FM 493 over Drainage Ditch?

It is owned by the State Highway Agency.