US Bridges

Siler RD over Isaac Creek

Fair

Frederick County, Virginia · 0.03 to 689 - 1.55 to 687 · Structure no. 000000000008177

Built
1969
56 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
82 ft
2 main spans
Daily traffic
823
2022 count
Owner
State
State Highway Agency

About this bridge

Siler RD over Isaac Creek is a steel stringer/multi-beam or girder carrying Siler RD over Isaac Creek in Frederick County, Virginia. It was built in 1969, so it is 56 years old, older than the Virginia average of 50.7 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 823 vehicles a day, roughly 1% of them trucks, projected to reach 1,073 by 2042. The structure is 82 ft (25 m) long and 20 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSiler RD
CrossesIsaac Creek
Location0.03 to 689 - 1.55 to 687
RouteCounty Highway 600
CountyFrederick County
StateVirginia
Coordinates39.3059, -78.25278
Functional classRural Minor 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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating56.3 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans2
Design loadUnknown
Structure length82 ft (25 m)
Longest span41 ft (12.5 m)
Deck width20 ft (6.2 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic823 (2022)
Projected traffic1,073 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$83 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Siler RD over Isaac Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is Siler RD over Isaac Creek 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 March 2024.

How much traffic does Siler RD over Isaac Creek carry?

About 823 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Siler RD over Isaac Creek?

The structure is 82 ft (25 m) long with a longest span of 41 ft (12.5 m) and a deck 20 ft wide.

Who owns Siler RD over Isaac Creek?

It is owned by the State Highway Agency.