US Bridges

SH 121 over Watters Branch

Good

Collin County, Texas · 3.4 MI W of US 75 · Structure no. 180430036404144

Built
2005
20 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
67 ft
4 main spans
Daily traffic
76,084
2020 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH 121 over Watters Branch is a concrete culvert carrying SH 121 over Watters Branch in Collin County, Texas. It was built in 2005, so it is 20 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 76,084 vehicles a day, roughly 12% of them trucks, projected to reach 106,517 by 2040. The structure is 67 ft (20.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSH 121
CrossesWatters Branch
Location3.4 MI W of US 75
CountyCollin County
StateTexas
Coordinates33.13684, -96.70008
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic76,084 (2020)
Projected traffic106,517 by 2040
Trucks12%
Lanes on structure14
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerLocal Toll Authority
Maintained byLocal Toll Authority
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 SH 121 over Watters Branch built?

It was built in 2005, making it 20 years old in 2025.

What condition is SH 121 over Watters Branch 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 October 2023.

How much traffic does SH 121 over Watters Branch carry?

About 76,084 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is SH 121 over Watters Branch?

The structure is 67 ft (20.4 m) long with a longest span of 15 ft (4.6 m).

Who owns SH 121 over Watters Branch?

It is owned by the Local Toll Authority.