US Bridges

CR 99 over Mustang Bayou

Fair

Brazoria County, Texas · 0.10 MI NE of SH 6 · Structure no. 120200AA0690005

Built
2003
22 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
78 ft
6 main spans
Daily traffic
5,280
2016 count
Owner
County
County Highway Agency

About this bridge

CR 99 over Mustang Bayou is a wood or timber stringer/multi-beam or girder carrying CR 99 over Mustang Bayou in Brazoria County, Texas. It was built in 2003, so it is 22 years old, younger 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 5,280 vehicles a day, roughly 1% of them trucks, projected to reach 3,000 by 2031. The structure is 78 ft (23.8 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCR 99
CrossesMustang Bayou
Location0.10 MI NE of SH 6
RouteCounty Highway 99
CountyBrazoria County
StateTexas
Coordinates29.45496, -95.31467
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans6
Design loadUnknown
Structure length78 ft (23.8 m)
Longest span13 ft (4 m)
Deck width27 ft (8.1 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,280 (2016)
Projected traffic3,000 by 2031
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5,000
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 99 over Mustang Bayou built?

It was built in 2003, making it 22 years old in 2025.

What condition is CR 99 over Mustang 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 2023.

How much traffic does CR 99 over Mustang Bayou carry?

About 5,280 vehicles per day (2016 count), of which roughly 1% are trucks.

How long is CR 99 over Mustang Bayou?

The structure is 78 ft (23.8 m) long with a longest span of 13 ft (4 m) and a deck 27 ft wide.

Who owns CR 99 over Mustang Bayou?

It is owned by the County Highway Agency.