US Bridges

Silver Run Valley over Big Silver Run

Fair

Carroll County, Maryland · 0.75 MI E of Md 97 · Structure no. 200000CL0273010

Built
1900
125 years old
Condition
Fair
inspected May 2024
Type
Truss - Thru
Steel
Length
31 ft
1 main span
Daily traffic
480
2021 count
Owner
County
County Highway Agency

About this bridge

Silver Run Valley over Big Silver Run is a steel truss - thru carrying Silver Run Valley over Big Silver Run in Carroll County, Maryland. It was built in 1900, so it is 125 years old, older than the Maryland average of 52.6 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 480 vehicles a day, roughly 5% of them trucks, projected to reach 790 by 2041. The structure is 31 ft (9.5 m) long and 13 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSilver Run Valley
CrossesBig Silver Run
Location0.75 MI E of Md 97
RouteCounty Highway 92
CountyCarroll County
StateMaryland
Coordinates39.696, -77.03969
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.5 US tons
Inventory rating27 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length31 ft (9.5 m)
Longest span30 ft (9.1 m)
Deck width13 ft (3.9 m)
Roadway width11 ft (3.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic480 (2021)
Projected traffic790 by 2041
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$240,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Silver Run Valley over Big Silver Run built?

It was built in 1900, making it 125 years old in 2025.

What condition is Silver Run Valley over Big Silver Run 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 Silver Run Valley over Big Silver Run carry?

About 480 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Silver Run Valley over Big Silver Run?

The structure is 31 ft (9.5 m) long with a longest span of 30 ft (9.1 m) and a deck 13 ft wide.

Who owns Silver Run Valley over Big Silver Run?

It is owned by the County Highway Agency.