US Bridges

SH 21 over Clear Fork Plum Creek

Good

Hays County, Texas · 0.3 MI S of RM 150 · Structure no. 141060047102066

Built
1944
81 years old, rebuilt 2007
Condition
Good
inspected September 2024
Type
Culvert
Concrete
Length
41 ft
4 main spans
Daily traffic
14,573
2023 count
Owner
State
State Highway Agency

About this bridge

SH 21 over Clear Fork Plum Creek is a concrete culvert carrying SH 21 over Clear Fork Plum Creek in Hays County, Texas. It was built in 1944 and reconstructed in 2007, so it is 81 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 14,573 vehicles a day, roughly 14% of them trucks, projected to reach 18,653 by 2042. The structure is 41 ft (12.5 m) long and 84 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSH 21
CrossesClear Fork Plum Creek
Location0.3 MI S of RM 150
RouteState Highway 21
StateTexas
Coordinates29.93213, -97.82203
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length41 ft (12.5 m)
Longest span9 ft (2.7 m)
Deck width84 ft (25.7 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,573 (2023)
Projected traffic18,653 by 2042
Trucks14%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 SH 21 over Clear Fork Plum Creek built?

It was built in 1944, making it 81 years old in 2025. It was reconstructed in 2007.

What condition is SH 21 over Clear Fork Plum Creek 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 September 2024.

How much traffic does SH 21 over Clear Fork Plum Creek carry?

About 14,573 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is SH 21 over Clear Fork Plum Creek?

The structure is 41 ft (12.5 m) long with a longest span of 9 ft (2.7 m) and a deck 84 ft wide.

Who owns SH 21 over Clear Fork Plum Creek?

It is owned by the State Highway Agency.