US Bridges

CR 171 over Flores Bayou

FairPosted for load

Brazoria County, Texas · 4.20 MI NE of SH 35 · Structure no. 120200AA0812004

Built
1963
62 years old
Condition
Fair
inspected December 2023
Type
Slab
Concrete
Length
81 ft
3 main spans
Daily traffic
1,870
2019 count
Owner
County
County Highway Agency

About this bridge

CR 171 over Flores Bayou is a concrete slab carrying CR 171 over Flores Bayou in Brazoria County, Texas. It was built in 1963, so it is 62 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. Its operating status is: posted for load restriction.

It carries about 1,870 vehicles a day, roughly 2% of them trucks, projected to reach 3,500 by 2032. The structure is 81 ft (24.7 m) long and 28 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesCR 171
CrossesFlores Bayou
Location4.20 MI NE of SH 35
RouteCounty Highway 171
CountyBrazoria County
StateTexas
Coordinates29.21583, -95.35885
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum 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 rating36 US tons
Inventory rating27 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length81 ft (24.7 m)
Longest span27 ft (8.2 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,870 (2019)
Projected traffic3,500 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5,000
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 171 over Flores Bayou built?

It was built in 1963, making it 62 years old in 2025.

What condition is CR 171 over Flores 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 December 2023.

How much traffic does CR 171 over Flores Bayou carry?

About 1,870 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is CR 171 over Flores Bayou?

The structure is 81 ft (24.7 m) long with a longest span of 27 ft (8.2 m) and a deck 28 ft wide.

Who owns CR 171 over Flores Bayou?

It is owned by the County Highway Agency.