US Bridges

Monumental Mill RD over Duncan Run

Fair

Culpeper County, Virginia · 1.10 from 229&1.40 to 628 · Structure no. 000000000005654

Built
1985
40 years old
Condition
Fair
inspected November 2023
Type
Culvert
Steel
Length
31 ft
3 main spans
Daily traffic
1,077
2022 count
Owner
State
State Highway Agency

About this bridge

Monumental Mill RD over Duncan Run is a steel culvert carrying Monumental Mill RD over Duncan Run in Culpeper County, Virginia. It was built in 1985, so it is 40 years old, younger 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 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 1,077 vehicles a day, projected to reach 1,148 by 2042. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesMonumental Mill RD
CrossesDuncan Run
Location1.10 from 229&1.40 to 628
RouteCounty Highway 640
CountyCulpeper County
StateVirginia
Coordinates38.5856, -77.99621
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,077 (2022)
Projected traffic1,148 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Monumental Mill RD over Duncan Run built?

It was built in 1985, making it 40 years old in 2025.

What condition is Monumental Mill RD over Duncan 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 November 2023.

How much traffic does Monumental Mill RD over Duncan Run carry?

About 1,077 vehicles per day (2022 count).

How long is Monumental Mill RD over Duncan Run?

The structure is 31 ft (9.4 m) long with a longest span of 8 ft (2.4 m).

Who owns Monumental Mill RD over Duncan Run?

It is owned by the State Highway Agency.