US Bridges

SH 146 NB over Dickinson Bayou

Fair

Galveston County, Texas · 0.80 MI SE of FM 517 · Structure no. 120850038906068

Built
1976
49 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,900 ft
1 main span
Daily traffic
11,007
2020 count
Owner
State
State Highway Agency

About this bridge

SH 146 NB over Dickinson Bayou is a prestressed concrete stringer/multi-beam or girder carrying SH 146 NB over Dickinson Bayou in Galveston County, Texas. It was built in 1976, so it is 49 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 11,007 vehicles a day, roughly 8% of them trucks, projected to reach 13,200 by 2033. The structure is 1,900 ft (579.1 m) long and 38 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesSH 146 NB
CrossesDickinson Bayou
Location0.80 MI SE of FM 517
RouteState Highway 146
CountyGalveston County
StateTexas
Coordinates29.46139, -94.97277
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+24 approach)
Design loadHS 20
Structure length1,900 ft (579.1 m)
Longest span100 ft (30.5 m)
Deck width38 ft (11.5 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,007 (2020)
Projected traffic13,200 by 2033
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed6.8 mi (11 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SH 146 NB over Dickinson Bayou built?

It was built in 1976, making it 49 years old in 2025.

What condition is SH 146 NB over Dickinson Bayou 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 September 2024.

How much traffic does SH 146 NB over Dickinson Bayou carry?

About 11,007 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is SH 146 NB over Dickinson Bayou?

The structure is 1,900 ft (579.1 m) long with a longest span of 100 ft (30.5 m) and a deck 38 ft wide.

Who owns SH 146 NB over Dickinson Bayou?

It is owned by the State Highway Agency.