US Bridges

FM 506 over Arroyo Colorado

Fair

Cameron County, Texas · 0.90 MI N of FM 3067 · Structure no. 210310087204004

Built
1958
67 years old, rebuilt 1998
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
303 ft
10 main spans
Daily traffic
2,126
2024 count
Owner
State
State Highway Agency

About this bridge

FM 506 over Arroyo Colorado is a concrete stringer/multi-beam or girder carrying FM 506 over Arroyo Colorado in Cameron County, Texas. It was built in 1958 and reconstructed in 1998, so it is 67 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 6 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 2,126 vehicles a day, roughly 20% of them trucks, projected to reach 3,010 by 2033. The structure is 303 ft (92.4 m) long and 45 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesFM 506
CrossesArroyo Colorado
Location0.90 MI N of FM 3067
RouteState Highway 506
CountyCameron County
StateTexas
Coordinates26.12962, -97.82366
Functional classUrban Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour evaluation has not been made
Structural evaluation6: Equal to 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 rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans10
Design loadOther
Structure length303 ft (92.4 m)
Longest span30 ft (9.1 m)
Deck width45 ft (13.8 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,126 (2024)
Projected traffic3,010 by 2033
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 506 over Arroyo Colorado built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1998.

What condition is FM 506 over Arroyo Colorado 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 March 2023.

How much traffic does FM 506 over Arroyo Colorado carry?

About 2,126 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is FM 506 over Arroyo Colorado?

The structure is 303 ft (92.4 m) long with a longest span of 30 ft (9.1 m) and a deck 45 ft wide.

Who owns FM 506 over Arroyo Colorado?

It is owned by the State Highway Agency.