US Bridges

FM 1660 over Cottonwood Creek

Good

Williamson County, Texas · 0.85 MI N of US 79 · Structure no. 142460156601004

Built
1966
59 years old, rebuilt 1991
Condition
Good
inspected March 2023
Type
Culvert
Concrete
Length
73 ft
6 main spans
Daily traffic
5,946
2021 count
Owner
State
State Highway Agency

About this bridge

FM 1660 over Cottonwood Creek is a concrete culvert carrying FM 1660 over Cottonwood Creek in Williamson County, Texas. It was built in 1966 and reconstructed in 1991, so it is 59 years old, older 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 5,946 vehicles a day, roughly 9% of them trucks, projected to reach 8,800 by 2041. The structure is 73 ft (22.3 m) long and 52 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesFM 1660
CrossesCottonwood Creek
Location0.85 MI N of US 79
RouteState Highway 1660
CountyWilliamson County
StateTexas
Coordinates30.55556, -97.54455
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadOther
Structure length73 ft (22.3 m)
Longest span10 ft (3 m)
Deck width52 ft (15.9 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,946 (2021)
Projected traffic8,800 by 2041
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$6,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 1660 over Cottonwood Creek built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1991.

What condition is FM 1660 over Cottonwood Creek 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 March 2023.

How much traffic does FM 1660 over Cottonwood Creek carry?

About 5,946 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is FM 1660 over Cottonwood Creek?

The structure is 73 ft (22.3 m) long with a longest span of 10 ft (3 m) and a deck 52 ft wide.

Who owns FM 1660 over Cottonwood Creek?

It is owned by the State Highway Agency.