US Bridges

SH 6 NB over Navasota River

Fair

Brazos County, Texas · 1.95 MI SE of FM 2154 · Structure no. 170210005002053

Built
1971
54 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
580 ft
1 main span
Daily traffic
18,547
2021 count
Owner
State
State Highway Agency

About this bridge

SH 6 NB over Navasota River is a prestressed concrete stringer/multi-beam or girder carrying SH 6 NB over Navasota River in Brazos County, Texas. It was built in 1971, so it is 54 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 18,547 vehicles a day, roughly 15% of them trucks, projected to reach 25,965 by 2041. The structure is 580 ft (176.8 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 6 NB
CrossesNavasota River
Location1.95 MI SE of FM 2154
RouteState Highway 6
CountyBrazos County
StateTexas
Coordinates30.41899, -96.10632
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+7 approach)
Design loadHS 20
Structure length580 ft (176.8 m)
Longest span90 ft (27.4 m)
Deck width44 ft (13.5 m)
Roadway width42 ft (12.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,547 (2021)
Projected traffic25,965 by 2041
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 6 NB over Navasota River built?

It was built in 1971, making it 54 years old in 2025.

What condition is SH 6 NB over Navasota River 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 February 2023.

How much traffic does SH 6 NB over Navasota River carry?

About 18,547 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is SH 6 NB over Navasota River?

The structure is 580 ft (176.8 m) long with a longest span of 90 ft (27.4 m) and a deck 44 ft wide.

Who owns SH 6 NB over Navasota River?

It is owned by the State Highway Agency.