US Bridges

CO 7/7 over Twin Branch

PoorPosted for load

McDowell County, West Virginia · 0.01 Mile East of Co. 7/5 · Structure no. 00000000024A373

Built
1935
90 years old
Condition
Poor
inspected August 2024
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
250
2023 count
Owner
State
State Highway Agency

About this bridge

CO 7/7 over Twin Branch is a concrete slab carrying CO 7/7 over Twin Branch in McDowell County, West Virginia. It was built in 1935, so it is 90 years old, older than the West Virginia average of 44.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 250 vehicles a day, roughly 9% of them trucks, projected to reach 263 by 2043. The structure is 24 ft (7.4 m) long and 20 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesCO 7/7
CrossesTwin Branch
Location0.01 Mile East of Co. 7/5
RouteCounty Highway 77
CountyMcDowell County
StateWest Virginia
Coordinates37.4808, -81.66761
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating44 US tons
Inventory rating20 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length24 ft (7.4 m)
Longest span23 ft (6.9 m)
Deck width20 ft (6.2 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic263 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$350,000 (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was CO 7/7 over Twin Branch built?

It was built in 1935, making it 90 years old in 2025.

What condition is CO 7/7 over Twin Branch in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does CO 7/7 over Twin Branch carry?

About 250 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is CO 7/7 over Twin Branch?

The structure is 24 ft (7.4 m) long with a longest span of 23 ft (6.9 m) and a deck 20 ft wide.

Who owns CO 7/7 over Twin Branch?

It is owned by the State Highway Agency.