Facility · Colorado ·
Managed by the USDA Forest Service
Trevarton (Lillian) (UNK) · Closed to Public Access
Due to the severe damage from the Twin Sisters debris slide during the 2013 Flood, this is no longer a through road. Approximately 1/4 mile of the road was destroyed and the land here is too unstable to rebuild this portion of the road.
North and south portions of the road up to the slide area are available, with small turnarounds and some parking on either side. Each side also includes an educational kiosk. High-clearance vehicles are recommended. You can access the southern portion of the road from Larimer County Road 47 and the northern portion from Fish Creek Road.
Visitors are urged to use caution and not enter the slide-impacted area ue to unstable soils and rocks.
40.23497, -105.50176 · 40°14'5.9"N 105°30'6.3"W
Typically 74°F in Jul, down to 32°F in Jan.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 32 | 35 | 42 | 46 | 56 | 69 | 74 | 73 | 66 | 52 | 41 | 33 |
| Low °F | 14 | 15 | 20 | 23 | 32 | 38 | 44 | 43 | 37 | 29 | 20 | 14 |
| Precip in | — | — | — | — | — | — | — | — | — | — | — | — |
1991–2020 averages from the nearest NOAA station, 1 mi away — not measured at the facility itself, and elevation can make a real difference over that distance.
Recreation.gov last updated this record on 2026-02-25.
Facility information and photographs from Recreation.gov (RIDB). SpotOpened is not affiliated with Recreation.gov or any federal agency.
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