Rockville, MD · separated · paved

Great Seneca Highway Bicycle Route

4.4 mi Out-and-back 171 ft gain

4.4-mile paved route with 171 ft of elevation gain, signed as part of the regional cycle network, route reference “119”, separated from motor traffic.

Live · updated Jul 28, 1:51 PM ET

Today's verdict

Thunderstorms in the forecast — lightning and cyclists are a bad combination.

Thunderstorms — lightning and cyclists do not mix — get off the road before they arrive.
41 mph wind — gusty and hazardous on exposed bridges and overpasses.
Pavement: wet — wet during the likely ride window — reduced braking, road spray, limited visibility to drivers.

0 /100

skip

0 Bike commuting

0 Road

0 E-bike

0 Bike-share

Best for bike commuting today

Route map

Orange marker is the start. Click the map to enable scroll-zoom — the polyline is approximate; use Ride with GPS or Komoot for turn-by-turn.

Atmosphere

Air temp

82°F

Mostly Cloudy
Wind

41 mph

SW
Rain

86%

Next 24h: 0.72"
Humidity

70%

Surface & daylight

Pavement

wet

paved surface
Sunrise

6:05 AM
Sunset

8:25 PM

395 min remaining

Best time today

Every remaining hour today is flagged hazardous. Save it for tomorrow.

Wind on this route

41 mph tailwind outbound — expect a 41 mph headwind on the return.

Currently 41 mph from the SSE (150°). Relative to this ride's overall bearing, a quartering tailwind.

Leg 1 Bearing 304° · tailwind 0.4 mi
Leg 2 Bearing 282° · quartering tailwind 0.4 mi
Leg 3 Bearing 273° · quartering tailwind 0.4 mi
Leg 4 Bearing 312° · tailwind 0.4 mi
Leg 5 Bearing 327° · tailwind 0.4 mi
Leg 6 Bearing 334° · tailwind 0.4 mi
Leg 7 Bearing 18° · quartering tailwind 0.4 mi
Leg 8 Bearing 15° · quartering tailwind 0.4 mi

Elevation profile

229 ft gain 193 ft loss Max 469' Min 302' 4.2 mi sampled

Score breakdown

82°F air Within comfort range, outside ideal

-3

−

41 mph wind Gusty and hazardous on exposed bridges and overpasses.

-36

Quartering tailwind 41 mph tailwind outbound — expect a 41 mph headwind on the return.

−

Thunderstorms Lightning and cyclists do not mix — get off the road before they arrive.

-45

−

Pavement: wet Wet during the likely ride window — reduced braking, road spray, limited visibility to drivers.

-32

Advisories & nearby alerts

NWSTest Message

About this route

Distance: 4.4 mi one-way (double for round-trip)
Elevation gain: 171 ft
Surface: paved
Shape: Out-and-back
Traffic exposure: separated
Activities: road cycling · e bike · commuting · bike share-touring
Cycle network: RCN · route 119
Start: 39.1334, -77.2450
City hub: Rockville, MD
OSM: relation 17202907

Description sourced from OpenStreetMap relation tags and member-way geometry.