Deep Cut Guide

North Fork of the St. Vrain River

82 routes and 47 boulder problems · granite (Silver Plume Granite) · 6,020 ft

Take me there Routes ↓ Directions

Help locate these routes: survey the wall

What's here

5.3 to 5.14, mostly around 5.10.

  1. 1 5.3
  2. 5 5.6
  3. 9 5.7
  4. 8 5.8
  5. 7 5.9
  6. 19 5.10
  7. 11 5.11
  8. 12 5.12
  9. 9 5.13
  10. 1 5.14

V0 to V13, mostly around V1.

  1. 4 V0
  2. 9 V1
  3. 8 V2
  4. 7 V3
  5. 5 V4
  6. 4 V5
  7. 2 V6
  8. 1 V7
  9. 2 V8
  10. 1 V9
  11. 1 V10
  12. 2 V11
  13. 1 V13

Counted from the 129 climbs here that carry a grade. Shown only where there are at least 5 of them — below that the shape is noise.

How well located

Base placed (one source) 5  Position on wall known 80  Crag only 44 

The order of the climbs along this wall is known from the open catalogue, so a few surveys go a long way: standing at Technicolor Nightmare, Livewire, Dihedral [River Wall] aka Shades of Murky Depths (3 climbs, about 90 seconds on River Wall II) would place up to 16 more climbs between them. Survey the wall →

“Up to” because the estimate between two surveyed routes is only used when they turn out to be close enough together on the ground.

The guidebook for this area

Rock Climbing St. Vrain Canyons - Bernard Gillett every crag it covers

From the publisher

The book has the topos, the descriptions and the local knowledge this page can't. Buying it helps support the people who know the crag best.

Rock, from the geologic map

Brecciated Rock. .

breccia

This is the map unit under this crag's map point, read from the 1:100,000 sheet (Colton, Roger B., 1976, U.S. Geological Survey Geologic Investigations Series I-855-G). The point can be a few hundred metres from the rock, a cliff often stands on the line between two units, and at that scale a line on the map is about 100 m wide on the ground, so the wall itself may be the neighbouring unit. The rock named at the top of this page comes from the public geology of this area; this card is the map's answer. Every crag on this unit: Brecciated Rock. Geology data: Macrostrat (CC BY 4.0), serving USGS and Colorado Geological Survey maps.

On the map since 1902

The USGS has mapped this ground since 1902. 29 historical sheets cover this crag's map point; the oldest is below.

Thumbnail of the 1902 USGS sheet covering North Fork of the St. Vrain River
USGS 1:62500-scale Quadrangle for Boulder, CO 1902 · U.S. Geological Survey · 1902 · 1:62,500 sheet
USGS Historical Topographic Map Collection · Public domain · the record · placed by its coordinates
Report this item

Hidden as soon as you tell us, everywhere it appears, before anyone reviews it.

Public domain, U.S. Geological Survey. The sheet shows the ground as the survey found it then, which is why a trail or road you know may be missing. Every sheet over this point, 1902 to 1984: USGS topoView.

Routes

Also within 3 km

Straight line between the two crags' map points, each of which can be some way from its rock. For when this wall is full, or the sun has found it.

Photos from climbers

No photos here yet. If you're at the crag, yours would be the first.

Pick a photo from your camera roll rather than taking one here: a picture taken inside a browser usually has no location saved in it, and we check that the photo was taken at this crag before publishing it. Photos of guidebook pages and topos are refused — they're the author's work. By sending one you're letting us publish it.

Nobody reviews these before they appear, so anyone can report one and it's hidden straight away — including you, if you change your mind, and including a photographer who finds their own picture here.

Taken at the crag by climbers and published as they sent them. Each one's own location had to be within 0.5 km of this crag before we accepted it. See something that shouldn't be here? Use Report this photo under it and it's hidden at once. Anything else, write to us.

Sun today
sun 09:40-15:20
Wall faces SW (USGS elevation). Shade from the surrounding terrain is counted.
Deep terrain: the skyline averages 18° above horizontal, so the sun has to climb well clear of the rim before it reaches this wall.
Crags by sun and shade →
Rain & forecast
0 mm of rain in the last 48 hours.
11-11 60°/42° · 0.0 mm · 10 mph · pm storms 0% 11-12 60°/44° · 0.0 mm · 11 mph · pm storms 0% 11-13 60°/42° · 0.0 mm · 8 mph · pm storms 0%
Open-Meteo, fetched 2026-11-11 18:40 UTC

Conditions reported

Nothing reported recently.

Report what you see

Reports are dated and fade on their own: wet rock after 3 days, a bad bolt after a year. No names, no text.

Access & safety

Emergency: call 911. Read out your location: Works without signal. If GPS fails, this crag's approximate map point is 40.24453 N, 105.33163 W (North Fork of the St. Vrain River). That point can be off by hundreds of metres, so say so.

The map point for this crag is on land managed by Boulder County Parks & Open Space (local government), in Billings.

The boundary is close. Land managed by Boulder County, CO comes within 250 m of this point, and the point is not the rock — the wall itself may be on the other side of the line. Check which before you rely on either one's rules.

Worth checking first. PAD-US records public access to this unit as “closed” (according to CNHP COMaP, 2016). That is about getting onto the unit at all, not about climbing, and we have not checked it against Boulder County Parks & Open Space's own page.

Land manager from USGS PAD-US (public domain), read 2026-09-29. It is the manager of the crag's map point, which can be a long way from the wall. What you may do on the rock is the manager's to say, not ours.

Nobody has yet read Boulder County Parks & Open Space's own rules for this crag and written them down here, so treat the above as where you are, not as what you may do.

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