US Bridges

CR 100 over Brazos Riv Auth Canal

Good

Brazoria County, Texas · 0.55 MI E of FM 1128 · Structure no. 120200AA0649001

Built
2011
14 years old
Condition
Good
inspected August 2023
Type
Other
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
2,552
2016 count
Owner
County
County Highway Agency

About this bridge

CR 100 over Brazos Riv Auth Canal is a prestressed concrete other carrying CR 100 over Brazos Riv Auth Canal in Brazoria County, Texas. It was built in 2011, so it is 14 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,552 vehicles a day, roughly 2% of them trucks, projected to reach 2,000 by 2031. The structure is 40 ft (12.2 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCR 100
CrossesBrazos Riv Auth Canal
Location0.55 MI E of FM 1128
RouteCounty Highway 100
CountyBrazoria County
StateTexas
Coordinates29.51595, -95.32108
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeOther
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,552 (2016)
Projected traffic2,000 by 2031
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 100 over Brazos Riv Auth Canal built?

It was built in 2011, making it 14 years old in 2025.

What condition is CR 100 over Brazos Riv Auth Canal 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 2023.

How much traffic does CR 100 over Brazos Riv Auth Canal carry?

About 2,552 vehicles per day (2016 count), of which roughly 2% are trucks.

How long is CR 100 over Brazos Riv Auth Canal?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns CR 100 over Brazos Riv Auth Canal?

It is owned by the County Highway Agency.