US Bridges

FM 646 NB over Gissler Gully

Good

Galveston County, Texas · 0.30 MI SW of IH 45 · Structure no. 120850304901249

Built
2009
16 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
150 ft
3 main spans
Daily traffic
12,228
2020 count
Owner
State
State Highway Agency

About this bridge

FM 646 NB over Gissler Gully is a prestressed concrete stringer/multi-beam or girder carrying FM 646 NB over Gissler Gully in Galveston 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 12,228 vehicles a day, roughly 5% of them trucks, projected to reach 11,170 by 2033. The structure is 150 ft (45.7 m) long and 35 ft wide.

Location

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CarriesFM 646 NB
CrossesGissler Gully
Location0.30 MI SW of IH 45
RouteState Highway 646
CountyGalveston County
StateTexas
Coordinates29.46296, -95.09489
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
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 typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span50 ft (15.2 m)
Deck width35 ft (10.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,228 (2020)
Projected traffic11,170 by 2033
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 646 NB over Gissler Gully built?

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

What condition is FM 646 NB over Gissler Gully 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 August 2024.

How much traffic does FM 646 NB over Gissler Gully carry?

About 12,228 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is FM 646 NB over Gissler Gully?

The structure is 150 ft (45.7 m) long with a longest span of 50 ft (15.2 m) and a deck 35 ft wide.

Who owns FM 646 NB over Gissler Gully?

It is owned by the State Highway Agency.