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3,533 ft
Distance
6 ft
Climb
-10 ft
Descent
00:04:54
Avg time
-3 ft
Altitude change
197 ft
Altitude min
204 ft
Altitude max
200 ft
Altitude start
197 ft
Altitude end
-0.1%
Grade
-5.2%
Grade max
5.2%
Grade min
354 ft
Distance climb
505 ft
Distance down
2,648 ft
Distance flat
00:04:54
Avg time
Retrograde (upstream) Details
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Activities
- Mountain Bike
- E-Bike
-
Riding AreaMerrimack
, New Hampshire -
Difficulty Rating
-
Voted DifficultyBlue (1 vote)
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Local Popularity95 in Mountain Biking [+]
- 80 in E-Biking
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Global Ranking
-
State Ranking
-
Trail TypeSingletrack
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DirectionBoth Directions
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Climb DifficultyBlue
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Physical RatingModerate
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Trail VisibilityAlways easy to follow
-
eBike AllowedYes up to Class 1
No community description for Retrograde (upstream) trail has been added yet!
AI Generated Description
Retrograde (upstream) is a 3,533 ft popular blue difficulty singletrack trail located near Merrimack New Hampshire. This mountain bike primary trail can be used both directions and has a moderate overall physical rating with a 6 ft blue climb. Trail visibility is always easy to follow. On average it takes 4 minutes to complete this trail.
Traditionally Indigenous Territory
Recent Activity on Trail
Past Week
- 7 rides
- 11 miles average
6 Months
- 68 rides
- 11 miles avg distance
All
- 486 rides
- Last: Sep 30, 2026
| c1 | c2 | c3 | c4 |
|---|---|---|---|
January | February | March | April |
May | June | July | August |
September | October | November | December |
Retrograde... Trail Reports
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Trail Conditions
- Unknown
- Snow Groomed
- Snow Packed
- Snow Covered
- Snow Cover Partial
- Freeze/thaw Cycle
- Icy
- Prevalent Mud
- Wet
- Variable
- Ideal
- Dry
- Very Dry
Trail Flow (Ridden Direction)
Trailforks scans users activity logs to determine the most popular direction each trail is ridden. A good flowing trail network will have most trails flowing in a single direction according to their intension.
The colour categories are based on what percentage of users are riding a trail in its intended direction.
The colour categories are based on what percentage of users are riding a trail in its intended direction.
- > 96%
- > 90%
- > 80%
- > 70%
- > 50%
- < 50%
- bi-directional trail
- no data
Trail Last Used
Trailforks scans activity logs to determine the last time a trail was ridden.
- < 2 days
- < 1 week
- < 2 weeks
- < 1 month
- < 6 months
- > 6 months
Trail Ridden Direction
The intended direction a trail should be ridden.
- Downhill Only
- Downhill Primary
- Both Directions
- Uphill Primary
- Uphill Only
- One Direction
Contribute Details
Colors indicate trail is missing specified detail.
- Description
- Photos
- Description & Photos
- Videos
Trail Popularity ?
Trailforks scans activity logs to determine which trails are ridden the most in the last 9 months.
Trails are compared with nearby trails in the same city region with a possible 25 colour shades.
Think of this as a heatmap, more activities = more kinetic energy = warmer colors.
- most popular
- popular
- less popular
- not popular
ATV/ORV/OHV Filter
Max Vehicle Width
inches
US Cell Coverage
Legend
Radar Time
Activity Recordings
Trailforks uses anonymized public activity data.
?
Activity Recordings
Trailforks uses anonymized public activity data.
?
Winter Trails
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A routing network for winter maps does not exist. Selecting trails using the winter trails layer has been disabled.
Missing Trails
Most Popular
Least Popular
Trails are colored based on popularity. The more popular a trail is, the more red. Less popular trails trend towards green.
Jump Magnitude Heatmap
Heatmap of where users jump on trails. Zoom in to see individual jumps, click circles to view jump details.
BC Backroad Status
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Slope Aspect
Direction the slope faces
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Directions to retrograde-upstream trailhead
(42.847580, -71.556930)
Photos
No photos have been added for Retrograde (upstream) yet, add a photo.
Videos
no videos have been added for Retrograde (upstream) yet, add a video.
Routes with this trail
31 miles • 2,928 ft • 26 • Point to Point •
Multi park tour. connecting from amherst and merrimack parcels
mappermook
Spectacular flow on this trail when ridden south-to-north. If you build enough speed initially, you can almost pump-track most of this trail, with little pedaling (in that direction). Nice waterside views, too.
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Nearby Trails
- Dark Matter 1,781 ft
- Singularity 1,808 ft
- Escape Velocity 2,054 ft
- Black Hole 2,441 ft
- Loop Trail Connector 2,579 ft
- By bikesmith74
& contributors - #443879 - 440 views
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