US Bridges

FM 580 over Colorado River

Fair

Lampasas County, Texas · 0.00 MI NW of Sn Saba C/L · Structure no. 231410023115066

Built
1971
54 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
690 ft
4 main spans
Daily traffic
324
2023 count
Owner
State
State Highway Agency

About this bridge

FM 580 over Colorado River is a steel continuous stringer/multi-beam or girder carrying FM 580 over Colorado River in Lampasas County, Texas. It was built in 1971, so it is 54 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 324 vehicles a day, roughly 13% of them trucks, projected to reach 410 by 2033. The structure is 690 ft (210.3 m) long and 28 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

Location

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CarriesFM 580
CrossesColorado River
Location0.00 MI NW of Sn Saba C/L
RouteState Highway 580
CountyLampasas County
StateTexas
Coordinates31.10044, -98.51472
Functional classRural Major 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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4 (+1 approach)
Design loadHS 20
Structure length690 ft (210.3 m)
Longest span190 ft (57.9 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic324 (2023)
Projected traffic410 by 2033
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 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 580 over Colorado River built?

It was built in 1971, making it 54 years old in 2025.

What condition is FM 580 over Colorado River 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 October 2023.

How much traffic does FM 580 over Colorado River carry?

About 324 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is FM 580 over Colorado River?

The structure is 690 ft (210.3 m) long with a longest span of 190 ft (57.9 m) and a deck 28 ft wide.

Who owns FM 580 over Colorado River?

It is owned by the State Highway Agency.