US Bridges

FM 6 over Bois Darc Crk

Fair

Collin County, Texas · 2.30 MI SW of FM 547 · Structure no. 180430061901004

Built
1942
83 years old, rebuilt 2011
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
35 ft
3 main spans
Daily traffic
3,962
2022 count
Owner
State
State Highway Agency

About this bridge

FM 6 over Bois Darc Crk is a concrete culvert carrying FM 6 over Bois Darc Crk in Collin County, Texas. It was built in 1942 and reconstructed in 2011, so it is 83 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.

It carries about 3,962 vehicles a day, roughly 3% of them trucks, projected to reach 9,243 by 2040. The structure is 35 ft (10.7 m) long and 51 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM 6
CrossesBois Darc Crk
Location2.30 MI SW of FM 547
RouteState Highway 6
CountyCollin County
StateTexas
Coordinates33.04642, -96.34474
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than 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 spans3
Design loadH 15
Structure length35 ft (10.7 m)
Longest span9 ft (2.7 m)
Deck width51 ft (15.4 m)
Roadway width51 ft (15.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,962 (2022)
Projected traffic9,243 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$3,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 6 over Bois Darc Crk built?

It was built in 1942, making it 83 years old in 2025. It was reconstructed in 2011.

What condition is FM 6 over Bois Darc Crk 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 FM 6 over Bois Darc Crk carry?

About 3,962 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is FM 6 over Bois Darc Crk?

The structure is 35 ft (10.7 m) long with a longest span of 9 ft (2.7 m) and a deck 51 ft wide.

Who owns FM 6 over Bois Darc Crk?

It is owned by the State Highway Agency.