Structure 200000M-0332010 · Montgomery County, MD

Montrose Parkway over Old Farm Creek Tributary

Carries Montrose Parkway over Old Farm Creek Tributary, 1.0 Mile West Of I-270.

Overall conditionFair

Set by its lowest-rated component: Superstructure at 6 of 9.

How ratings work
Superstructuresets the rating6/9 · Satisfactory
Substructure8/9 · Very Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT28 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck not ratedSuperstructure 6/9 · sets the ratingSubstructure 8/9

28 ft end to end. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a deck arch.

Built200620 years old
Length27.6 ft8.4 m
Daily traffic28,776counted 2022
Last inspectedOctober 2023every 24 months

Location

StateMaryland
CountyMontgomery
Location1.0 Mile West Of I-270
CarriesMontrose Parkway
CrossesOld Farm Creek Tributary
Coordinates39.05105, -77.13253

Physical Characteristics

MaterialConcrete
DesignArch - Deck
Total Length27.6 ft (8.4 m)
Max Span21.0 ft (6.4 m)
Deck Width149.9 ft (45.7 m)
Deck Area383.9 sq m
Main Spans1
Year Built2006

Traffic

Avg Daily Traffic28,776 (2022)
Truck Traffic5%
Lanes On Bridge4

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number200000M-0332010

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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