US Bridges

SH 321 NB over Union Pacific Railroad

Good

Liberty County, Texas · 0.8 MI SE of FM 686 · Structure no. 201460059301018

Built
2009
16 years old
Condition
Good
inspected February 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
185 ft
1 main span
Daily traffic
4,125
2024 count
Owner
State
State Highway Agency

About this bridge

SH 321 NB over Union Pacific Railroad is a prestressed concrete stringer/multi-beam or girder carrying SH 321 NB over Union Pacific Railroad in Liberty County, Texas. It was built in 2009, so it is 16 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 4,125 vehicles a day, roughly 13% of them trucks, projected to reach 6,800 by 2033. The structure is 185 ft (56.4 m) long and 40 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesSH 321 NB
CrossesUnion Pacific Railroad
Location0.8 MI SE of FM 686
RouteState Highway 321
CountyLiberty County
StateTexas
Coordinates30.08853, -94.91494
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1 (+2 approach)
Design loadHL 93
Structure length185 ft (56.4 m)
Longest span75 ft (22.9 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,125 (2024)
Projected traffic6,800 by 2033
Trucks13%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed19.3 mi (31 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SH 321 NB over Union Pacific Railroad built?

It was built in 2009, making it 16 years old in 2025.

What condition is SH 321 NB over Union Pacific Railroad 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 February 2022.

How much traffic does SH 321 NB over Union Pacific Railroad carry?

About 4,125 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is SH 321 NB over Union Pacific Railroad?

The structure is 185 ft (56.4 m) long with a longest span of 75 ft (22.9 m) and a deck 40 ft wide.

Who owns SH 321 NB over Union Pacific Railroad?

It is owned by the State Highway Agency.