US Bridges

CR 321 over Linnville Bayou

Good

Brazoria County, Texas · 3.25 MI S of CR 322 · Structure no. 120200AA0341002

Built
2005
20 years old
Condition
Good
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
225 ft
3 main spans
Daily traffic
300
2017 count
Owner
County
County Highway Agency

About this bridge

CR 321 over Linnville Bayou is a prestressed concrete box beam or girders - multiple carrying CR 321 over Linnville Bayou in Brazoria County, Texas. It was built in 2005, so it is 20 years old, younger 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 300 vehicles a day, projected to reach 440 by 2037. The structure is 225 ft (68.6 m) long and 27 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesCR 321
CrossesLinnville Bayou
Location3.25 MI S of CR 322
RouteCounty Highway 321
CountyBrazoria County
StateTexas
Coordinates28.98269, -95.76919
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length225 ft (68.6 m)
Longest span75 ft (22.9 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2017)
Projected traffic440 by 2037
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 321 over Linnville Bayou built?

It was built in 2005, making it 20 years old in 2025.

What condition is CR 321 over Linnville Bayou 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 November 2023.

How much traffic does CR 321 over Linnville Bayou carry?

About 300 vehicles per day (2017 count).

How long is CR 321 over Linnville Bayou?

The structure is 225 ft (68.6 m) long with a longest span of 75 ft (22.9 m) and a deck 27 ft wide.

Who owns CR 321 over Linnville Bayou?

It is owned by the County Highway Agency.