US Bridges

SH 21 over Mayhaw Creek

Fair

Bastrop County, Texas · 4.2 MI E of FM 812 · Structure no. 140110047105045

Built
1939
86 years old, rebuilt 1988
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
281 ft
8 main spans
Daily traffic
18,381
2023 count
Owner
State
State Highway Agency

About this bridge

SH 21 over Mayhaw Creek is a steel stringer/multi-beam or girder carrying SH 21 over Mayhaw Creek in Bastrop County, Texas. It was built in 1939 and reconstructed in 1988, so it is 86 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 18,381 vehicles a day, roughly 13% of them trucks, projected to reach 29,777 by 2042. The structure is 281 ft (85.6 m) long and 46 ft wide. If it were closed, the detour would be 23 mi (37 km).

Location

Open in Google Maps
CarriesSH 21
CrossesMayhaw Creek
Location4.2 MI E of FM 812
RouteState Highway 21
CountyBastrop County
StateTexas
Coordinates30.08613, -97.50554
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans8
Design loadH 15
Structure length281 ft (85.6 m)
Longest span35 ft (10.7 m)
Deck width46 ft (14 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,381 (2023)
Projected traffic29,777 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 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 Mayhaw Creek built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1988.

What condition is SH 21 over Mayhaw Creek 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 November 2024.

How much traffic does SH 21 over Mayhaw Creek carry?

About 18,381 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SH 21 over Mayhaw Creek?

The structure is 281 ft (85.6 m) long with a longest span of 35 ft (10.7 m) and a deck 46 ft wide.

Who owns SH 21 over Mayhaw Creek?

It is owned by the State Highway Agency.