US Bridges

I-77 SB over CR 21

Fair

Kanawha County, West Virginia · 0.99 MI N of CR 28 · Structure no. 00000000020A450

Built
1959
66 years old, rebuilt 1986
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
185 ft
1 main span
Daily traffic
16,100
2020 count
Owner
State
State Highway Agency

About this bridge

I-77 SB over CR 21 is a steel continuous stringer/multi-beam or girder carrying I-77 SB over CR 21 in Kanawha County, West Virginia. It was built in 1959 and reconstructed in 1986, so it is 66 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 fair condition with a lowest component rating of 5 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 16,100 vehicles a day, roughly 17% of them trucks, projected to reach 25,116 by 2040. The structure is 185 ft (56.5 m) long and 37 ft wide.

Location

Open in Google Maps
CarriesI-77 SB
CrossesCR 21
Location0.99 MI N of CR 28
RouteInterstate 77
CountyKanawha County
StateWest Virginia
Coordinates38.5096, -81.64416
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20 + Mod
Structure length185 ft (56.5 m)
Longest span90 ft (27.4 m)
Deck width37 ft (11.2 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,100 (2020)
Projected traffic25,116 by 2040
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$550,000 (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-77 SB over CR 21 built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1986.

What condition is I-77 SB over CR 21 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 May 2024.

How much traffic does I-77 SB over CR 21 carry?

About 16,100 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is I-77 SB over CR 21?

The structure is 185 ft (56.5 m) long with a longest span of 90 ft (27.4 m) and a deck 37 ft wide.

Who owns I-77 SB over CR 21?

It is owned by the State Highway Agency.