US Bridges

FM 487 over School House Hollow

Fair

Williamson County, Texas · 8.70 MI NW of IH 35 · Structure no. 142460120102009

Built
1955
70 years old, rebuilt 1988
Condition
Fair
inspected January 2023
Type
Culvert
Concrete
Length
64 ft
6 main spans
Daily traffic
1,409
2020 count
Owner
State
State Highway Agency

About this bridge

FM 487 over School House Hollow is a concrete culvert carrying FM 487 over School House Hollow in Williamson County, Texas. It was built in 1955 and reconstructed in 1988, so it is 70 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 1,409 vehicles a day, roughly 16% of them trucks, projected to reach 1,610 by 2033. The structure is 64 ft (19.5 m) long and 46 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesFM 487
CrossesSchool House Hollow
Location8.70 MI NW of IH 35
RouteState Highway 487
CountyWilliamson County
StateTexas
Coordinates30.84431, -97.72411
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadOther
Structure length64 ft (19.5 m)
Longest span10 ft (3 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,409 (2020)
Projected traffic1,610 by 2033
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 487 over School House Hollow built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1988.

What condition is FM 487 over School House Hollow 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 January 2023.

How much traffic does FM 487 over School House Hollow carry?

About 1,409 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is FM 487 over School House Hollow?

The structure is 64 ft (19.5 m) long with a longest span of 10 ft (3 m) and a deck 46 ft wide.

Who owns FM 487 over School House Hollow?

It is owned by the State Highway Agency.