South Saint Vrain + Sourdough Trail + Waldrop Trail loop

Roosevelt National Forest · 5.14 mi loop · about 2 hr 5 min

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This trail is a loop, so the distance below is already a round trip.

Round-trip distance5.14 micomputed
Elevation gain667 ftcomputed
Elevation loss676 ftcomputed
Est. time2 hr 5 minNaismith's rulecomputed
DifficultyNot ratedno source has rated itunknown
Highest
10,238 ft
Lowest
9,685 ft
Route type
Loop
Surface
Not mapped
Offline
Start500 mN
Schematic preview drawn from the trail geometry. No basemap yet; do not use for navigation. Start = circle.

Overview

South Saint Vrain + Sourdough Trail + Waldrop Trail loop is mapped as a loop of 5.14 mi in Roosevelt National Forest.

It runs between 9,685 ft and 10,238 ft above sea level, a difference of 553 ft.

Estimates

  • Computed effort band: moderate (from length and climb; not an official difficulty).
  • Estimated time 2 hr 5 min one way by Naismith's rule, which assumes steady walking and adds time for climbing. Real time varies.

Before you rely on this

  • No water source is mapped for this trail. That may only mean nobody has mapped one, so carry your own water.
  • Check the land manager for closures, seasonal rules and permits before you go; none of that is verified here.
Moderate effortLoops

Elevation

9,690 ft9,964 ft10,238 ft05.13 mi

Hover, tap, or use the arrow keys on the chart to read a point; it is shown on the map too.

Elevation along the trail from start (left) to end (right) as drawn. Values are computed from USGS 3DEP 1/3 arc-second DEM (public domain), sampled about every 10 m and smoothed. Shaded bands are sections steeper than about 12% (0 climbing in red, 1 descending in blue).
Steep sections (1)
  • 1.04 mi to 1.14 mi: about 17.8% downhill (from the elevation model, so rough)

Before you go

Parking
No parking is mapped near the start. not verified
Trailhead and directions
Start at 40.08526, -105.56513. Directions to the start ↗
Permits and fees
We have no verified permit or fee details. Official pages: Roosevelt National Forest ↗, Boulder County ↗ (we have not recorded when these were last checked). not verified
Dogs
No dog rule is tagged. not verified
Water
No water is mapped. Carry your own. not verified
Toilets and facilities
None mapped. not verified
Accessibility, bikes and horses
No access details are tagged. not verified
Seasonal rules, closures and hazards
Not verified here. Check the land manager (Roosevelt National Forest ↗) and read the hiker condition reports below. No report does not mean the trail is open or safe. not verified

Weather at the trailhead

Sun53° / 35°Mostly Sunny0% precip
Mon50° / 36°Mostly Sunny then Slight Chance Rain And Snow Showers19% precip
Tue52° / 37°Mostly Sunny11% precip
Wed54° / 39°Mostly Sunny2% precip
Thu58° / 40°Mostly Cloudy then Chance Rain Showers46% precip
Fri54° / 34°Rain And Snow Showers Likely61% precip
Sat44° / –Chance Snow Showers45% precip

Today: sunrise 7:15 AM, sunset 6:18 PM (computed from the trailhead location).

Forecast for the trailhead area from the U.S. National Weather Service, updated Oct 18, 12:46 AM. Mountain weather changes fast and can differ a lot by elevation: check the official forecast for your route before you go.

Recent conditions

Reports come from Arête members, not from land managers. They show when something was seen, not whether it is still true. Check official sources before you go.

No condition reports in the last 30 days. Conditions are unknown, not necessarily good.

Reviews

No reviews yet, so there is no rating to show. We never invent ratings. Sign in to be the first to review this trail.

Photos and places from hikers

Added by community members and checked by our team before they appear. Photos have their location data removed. These are not official information.

No approved photos or places yet.

Nearby trails

Arête-built route from mapped trails

Assembled by Arête from mapped trail segments. Not an official or recommended route.

  1. South Saint Vrain · 1.93 mi · walked back
  2. Sourdough Trail · 143 ft · walked back
  3. Sourdough Trail · 1.05 mi (part of the mapped trail) · walked back
  4. Waldrop Trail · 0.63 mi (part of the mapped trail) · walked back
  5. Waldrop Trail · 0.91 mi (part of the mapped trail) · walked back
  6. Waldrop Trail · 422 ft (part of the mapped trail) · walked back
  7. Waldrop Trail · 0.15 mi (part of the mapped trail) · walked back
  8. Waldrop Trail · 0.34 mi · walked back

Starts at a derived trailhead (1 mapped trail start within 150 m), no mapped parking within 400 m; the route starts at the nearest mapped trail junction, 0 m from that point. Built by Arête from the graph of mapped trail segments (OpenStreetMap). Segments join where their ends are within 12 m of each other or one ends on another's line (a T-junction). A loop returns to its start without repeating a trail section; an out-and-back goes to a mapped trail end and returns the same way, so its length counts both directions. Names come only from the mapped trails it uses. Length is measured on the joined line; elevation is computed from USGS 3DEP. Not an official or recommended route.

Data, sources and how the numbers are made
Length5.14 micomputed
Route typeLoopcomputed
SurfaceUnknownunknown
DifficultyUnknownunknown
Elevation gain (as drawn)667 ftcomputed
Elevation loss (as drawn)676 ftcomputed
Estimated durationabout 2 hr 5 min one way as drawn (Naismith's rule)computed
Official verificationNot verified by an official sourceunknown

Length is measured from the route geometry in the source data, so it can differ from signed or official distances. Gain and loss describe the direction the line is drawn; the route view above shows the other direction and out and back. Elevation is computed from USGS 3DEP 1/3 arc-second DEM (public domain), sampled about every 10 m and smoothed.

© OpenStreetMap contributors (ODbL). Route assembled by Arête from mapped trail segments.. Arête-built routes from mapped trails. Licence: ODbL 1.0 (derived from OpenStreetMap).

Frequently asked questions

How long is South Saint Vrain + Sourdough Trail + Waldrop Trail loop?

South Saint Vrain + Sourdough Trail + Waldrop Trail loop in Roosevelt National Forest is 5.14 mi long, measured from its route geometry in OpenStreetMap data. Signed or official distances can differ.

How much elevation does South Saint Vrain + Sourdough Trail + Waldrop Trail loop gain?

Walking from the start to the end as drawn, it climbs about 667 ft and descends about 676 ft, between 9,685 ft and 10,238 ft. These are computed from the USGS 3DEP elevation model and can differ from other apps; the other direction swaps climbing and descending.

How hard is South Saint Vrain + Sourdough Trail + Waldrop Trail loop?

Difficulty is unknown: no source we use rates this trail, and we don't guess. Use the length and elevation gain to judge it for yourself.

How long does South Saint Vrain + Sourdough Trail + Waldrop Trail loop take?

About 2 hr 5 min one way for a fit hiker, by Naismith's rule from the length and climb. It is an estimate: allow more for rest, photos, heat, altitude and weather.

Where does South Saint Vrain + Sourdough Trail + Waldrop Trail loop start?

The route starts near 40.0853, -105.5651 (Roosevelt National Forest, Boulder County). Use the Directions button to open it in your maps app.

Are dogs allowed on South Saint Vrain + Sourdough Trail + Waldrop Trail loop?

Not tagged in OpenStreetMap, so it is unknown. Check posted signs and the land manager's website.

Is there water, parking or a toilet at South Saint Vrain + Sourdough Trail + Waldrop Trail loop?

Mapped in OpenStreetMap near this trail: 0 water points, 0 parking areas, 0 toilets. Mapped water is not tested or guaranteed: carry your own. Fees and permits are not included here; check the official page.

Trail data can be wrong or out of date, and Arête is not an emergency service. Check official sources, weather and closures before you go.

Directions