Gnar Section


This is a one mile section upstream from the town of Drake.  It contains class V and V+ rapids.

Suggested river levels for paddling this section of the Big Thompson are between a bare minimum of 200cfs and a high of 700cfs. River conditions sourced from USGS 06707500, the South Platte River At South Platte Remember only watercraft are permitted at Gnar Section.

Disclaimer: Snoflo assumes no responsibility for errors or omissions in any of the content found here. You, the user assumes the entire risk associated with use of this data and content. terms of service

Area Hydrology

Gauge Streamflow Stage
Michigan River Near Cameron Pass
USGS 06614800
1 cfs 2.3 ft
Sand Creek At Colorado-Wyoming State Line
USGS 06659580
3 cfs 0.5 ft
Grand Lake Outlet Blw Chipmunk Ln At Grand Lk
USGS 09014050
7 cfs 8.3 ft
Williams Fork Above Darling Creek
USGS 09035700
14 cfs 4.7 ft
South Platte River At Englewood
USGS 06711565
59 cfs 1.4 ft
Cherry Creek At Denver
USGS 06713500
27 cfs 3.5 ft
Middle Boulder Creek At Nederland
USGS 06725500
3 cfs 0.3 ft
Big Dry Creek At Mouth Near Fort Lupton
USGS 06720990
24 cfs 4.6 ft
Laramie River At Laramie
USGS 06660000
48 cfs 4.7 ft
Cache La Poudre R Ab Boxelder C
USGS 06752280
4 cfs 0.8 ft
Snotel Site Snowpack 24hr Change
denver 0.4 e, co
SNOTEL CO-DN-175
0.22" 0"
longmont 3.3 sw, co
SNOTEL CO-BO-507
0.06" 0"
fort collins 5.4 wsw, co
SNOTEL CO-LR-623
0.26" 0"
denver 8 ssw, co
SNOTEL CO-DN-30
0.34" 0"
windsor 3.0 sse, co
SNOTEL CO-WE-507
1.05" -0.01"
parker 3.5 wnw, co
SNOTEL CO-DG-292
0.37" 0"
arvada 3.5 wnw, co
SNOTEL CO-JF-457
0.15" 0"
gross reservoir
SNOTEL GRRC2
1.58" 0.25"
evergreen
SNOTEL EVGC2
2.36" 0.11"
Crow Creek
SNOTEL 1045
13" 0"
denver 3.2 sse, co
SNOTEL CO-DN-49
0.56" 0.17"
cripple creek 5.1 nw, co
SNOTEL CO-TL-16
0.47" 0"
laporte 1.4 nw, co
SNOTEL CO-LR-761
0.87" 0.11"
denver 1.1 ne, co
SNOTEL CO-DN-280
0.22" 0"
Bear Lake
SNOTEL 322
38" 3"
High Lonesome
SNOTEL 1187
50" 2"
thornton 2.3 sse, co
SNOTEL CO-AD-22
0.08" 0"
buford 4se
SNOTEL BFDW4
1.88" -0.46"
Echo Lake
SNOTEL 936
14" 7"
lyons 0.3 nne, co
SNOTEL CO-BO-146
1.74" 0.62"
highlands ranch 3.2 ese, co
SNOTEL CO-DG-74
0.48" 0"
erie 0.5 se, co
SNOTEL CO-WE-392
0.07" 0"
Berthoud Summit
SNOTEL 335
39" 5"
windsor 3.8 wsw, co
SNOTEL CO-LR-845
0.42" 0.04"
broomfield 3.2 nne, co
SNOTEL CO-BR-32
0.09" 0"
loveland 2.4 nw, co
SNOTEL CO-LR-676
2.65" 0.11"
laramie 7sse
SNOTEL CMBW4
3.19" -0.12"
estes park 3.3 ssw, co
SNOTEL CO-LR-247
1.36" 1.1"
longmont 2.1 n, co
SNOTEL CO-BO-143
1.21" 0.2"
englewood #2
SNOTEL ENLC2
0.31" 0"
boulder 1.6 s, co
SNOTEL CO-BO-14
0.87" 0.18"
red feather 5.9 ne, co
SNOTEL CO-LR-329
1.14" -0.66"
highlands ranch 2.5 ssw, co
SNOTEL CO-DG-178
0.56" 0"
aurora 2.1 ese, co
SNOTEL CO-AR-313
0.26" 0"
littleton 6.0 w, co
SNOTEL CO-JF-376
0.99" 0.56"
fort collins 4.9 n, co
SNOTEL CO-LR-1020
2.13" -0.18"
fcl 2.3 nw, co
SNOTEL CO-LR-311
0.84" 0.01"
fort collins 4.6 n, co
SNOTEL CO-LR-762
0.99" -0.05"
castle rock 1.7 ssw, co
SNOTEL CO-DG-62
0.61" 0"
estes park,co
SNOTEL ETSC2
1.8" 1.1"
black forest 6wnw
SNOTEL BKFC2
0.22" 0"
nederland 4.2 e, co
SNOTEL CO-BO-233
5.14" 0.09"
conifer 3.2 sw, co
SNOTEL CO-JF-53
2.19" 0.53"
Rawah
SNOTEL 1032
28" 3"
cabin creek
SNOTEL GCRC2
12.95" 1.67"
south platte river
SNOTEL ANTC2
0.21" 0"
lafayette 0.8 wsw, co
SNOTEL CO-BO-266
0.65" 0.17"
niwot 2.3 w, co
SNOTEL CO-BO-248
1.85" 0.2"
golden 12.5 nw, co
SNOTEL CO-JF-331
5.33" 0.27"
Loveland Basin
SNOTEL 602
43" 2"
cripple creek,co
SNOTEL CRIC2
1.69" 0.94"
bellvue 5.9 w, co
SNOTEL CO-LR-4
0.93" -0.15"
aurora south
SNOTEL EAGC2
0.27" 0"
loveland 2.3 nw, co
SNOTEL CO-LR-854
2.65" 0.11"
aurora 4.0 sse, co
SNOTEL CO-AR-259
0.25" 0"
boulder 4.7 ene, co
SNOTEL CO-BO-220
0.75" 0.11"
fort collins 2.8 wsw, co
SNOTEL CO-LR-75
2.39" 0.09"
aspen springs amrad
SNOTEL ASIC2
2.09" 0.55"
longmont 8.2 ese, co
SNOTEL CO-WE-203
1.92" 0.17"
fcl 5.6 e, co
SNOTEL CO-LR-393
1.53" 0.08"
parker 2.1 wnw, co
SNOTEL CO-DG-146
0.32" 0"
virginia dale 7.2 ssw, co
SNOTEL CO-LR-672
0.41" -0.34"
wellington 0.4 nw, co
SNOTEL CO-LR-952
1.52" -0.12"
lake george 7.2 wnw, co
SNOTEL CO-PK-39
0.23" 0"
gleneagle 0.4 wnw, co
SNOTEL CO-EP-61
0.25" 0"
highlands ranch 0.6 sse, co
SNOTEL CO-DG-176
0.5" 0"
littleton 6.4 w, co
SNOTEL CO-JF-212
0.66" 0"
arvada 4.7 w, co
SNOTEL CO-JF-455
0.22" 0"
conifer 5.7 sw, co
SNOTEL CO-JF-222
0.83" 0.08"
estes park 1.8 sse, co
SNOTEL CO-LR-987
1.4" 0"
firestone
SNOTEL FSNC2
0.1" 0"
georgetown
SNOTEL GEOC2
3.7" 0.73"
boulder 1.9 se, co
SNOTEL CO-BO-30
0.71" 0.15"
ward 4.6 ne, co
SNOTEL CO-BO-202
8.03" 0.91"
Grizzly Peak
SNOTEL 505
44" 4"
westminster 1.6 ne, co
SNOTEL CO-AD-153
1.11" 0.19"
co st forest st park
SNOTEL CSFC2
20.08" 0.08"
denver 6.1 wsw, co
SNOTEL CO-JF-3
0.28" 0"
estes park 1.8 s, co
SNOTEL CO-LR-767
5.11" 1.2"
Niwot
SNOTEL 663
28" 5"
nederland 2.61 nne, co
SNOTEL CO-BO-75
4.94" 0.09"
fort lupton 7.4 nw, co
SNOTEL CO-WE-326
0.11" 0"
longmont 3.0 sw, co
SNOTEL CO-BO-435
0.05" 0"
amrad
SNOTEL CNRC2
2.32" 0.25"
rollinsville 1.7 e, co
SNOTEL CO-GL-25
4.14" 1.3"
nederland 5.8 e, co
SNOTEL CO-BO-57
7.67" -0.38"
lyons 4.8 n, co
SNOTEL CO-LR-50
3.09" 1.2"
erie 1.6 ne, co
SNOTEL CO-WE-209
0.45" 0.15"
cheesman
SNOTEL CHEC2
0.48" 0.09"
berthoud 4.4 wsw, co
SNOTEL CO-LR-922
1.94" 0.39"
lov 3.4 s, co
SNOTEL CO-LR-472
3.03" 0.19"
glen haven 1.2 n, co
SNOTEL CO-LR-868
1.54" 1.08"
loveland 2.7 e, co
SNOTEL CO-LR-687
1.57" 0.07"
fort collins 1.1 wnw, co
SNOTEL CO-LR-863
1.96" 0.06"
allens park 1.5 ese, co
SNOTEL CO-BO-22
10.71" 1.74"
fort collins 3.4 n, co
SNOTEL CO-LR-653
0.75" 0.08"
fcl 3.0 sw, co
SNOTEL CO-LR-391
2.75" 0.1"
Hourglass Lake
SNOTEL 1122
30" 4"
estes park 10.5 se, co
SNOTEL CO-LR-1019
3.02" 1.15"
monument 3s
SNOTEL DMDC2
0.23" 0"
westminster 2.3 sse, co
SNOTEL CO-AD-225
0.61" 0.35"
evergreen 4.2 sse, co
SNOTEL CO-JF-157
2.01" 0.7"
nederland 4.8 ene, co
SNOTEL CO-BO-110
4.91" 0.74"
loveland 1.5 n, co
SNOTEL CO-LR-40
3.07" 0.06"
denver/stapleton
SNOTEL DUAC2
0.21" 0"
bailey
SNOTEL BLYC2
1.21" -0.11"
fort collins 9.6 se, co
SNOTEL CO-LR-630
1.82" 0.06"
cr66
SNOTEL GEYC2
1.1" 0"
erie 1.7 wnw, co
SNOTEL CO-BO-455
0.08" 0"
arvada 2.1 sse, co
SNOTEL CO-JF-427
0.16" 0"
thornton 2.1 n, co
SNOTEL CO-AD-100
0.62" 0.2"
woodland park 1.1 nnw, co
SNOTEL CO-TL-28
0.13" 0"
ralston reservoir
SNOTEL GDNC2
0.41" 0"
arvada 3.8 w, co
SNOTEL CO-JF-240
0.15" 0"
longmont 1.8 ene, co
SNOTEL CO-BO-352
0.08" 0"
la porte 10.0 nnw, co
SNOTEL CO-LR-567
0.8" 0.08"
evergreen 2.0 ese, co
SNOTEL CO-JF-395
1.94" 0.24"
fcl 1.7 sw, co
SNOTEL CO-LR-320
3.18" 0.08"
fort collins
SNOTEL FORC2
2.34" 0.03"
longmont 1.8 e, co
SNOTEL CO-BO-361
0.3" 0.14"
evergreen 6.5 wsw, co
SNOTEL CO-CC-1
1.95" 0.08"
fcl 2.55 ne, co
SNOTEL CO-LR-340
0.75" 0.08"
grant
SNOTEL GRTC2
2.46" 0.06"
evergreen 3.4 wnw, co
SNOTEL CO-CC-22
1.81" 0.17"
boulder 1.8 w, co
SNOTEL CO-BO-491
0.37" 0.21"
boulder 2.9 s, co
SNOTEL CO-BO-4
0.95" 0.15"
englewood 1.4 n, co
SNOTEL CO-AR-292
0.26" 0"
aurora 4.2 nnw, co
SNOTEL CO-AD-127
0.22" 0"
monument 2.1 ene, co
SNOTEL CO-EP-17
0.92" 0.06"
evergreen 5 w, co
SNOTEL CO-CC-2
1.78" 0.16"
University Camp
SNOTEL 838
37" 5"
boulder 1.5 nnw, co
SNOTEL CO-BO-496
0.13" 0"
fort collins 3.7 s, co
SNOTEL CO-LR-885
1.36" 0.09"
fort collins 3.9 nne, co
SNOTEL CO-LR-112
4.66" 0.04"
Phantom Valley
SNOTEL 688
26" 1"
wellington 0.8 sw, co
SNOTEL CO-LR-1008
1.49" -0.11"
evergreen 1.3 nne, co
SNOTEL CO-JF-424
2.29" 0.07"
laramie 1se
SNOTEL ADFW4
2.39" -0.04"
broomfield 2.3 ssw, co
SNOTEL CO-JF-72
1.43" 0.12"
fcl 2.2 nw, co
SNOTEL CO-LR-273
2.7" -0.19"
boulder 1.5 wnw, co
SNOTEL CO-BO-490
3.94" -0.28"
fcl 3.0 w, co
SNOTEL CO-LR-284
2.17" 0.13"
lafayette 2.5 nw, co
SNOTEL CO-BO-222
0.65" 0.14"
loveland 2.8 wnw, co
SNOTEL CO-LR-1109
2.58" 0.11"
rollinsville 1.1 ssw, co
SNOTEL CO-GL-17
10.62" 1.72"
Windy Peak
SNOTEL 872
16" 3"
fort collins 4.2 s, co
SNOTEL CO-LR-758
2.81" 0.08"
boulder 4.7 e, co
SNOTEL CO-BO-67
0.7" 0.15"
fort collins 2.8 w, co
SNOTEL CO-LR-1009
2.89" 0.09"
estes park 1.7 w, co
SNOTEL CO-LR-1115
7.25" 1.18"
fort collins 0.9 n, co
SNOTEL CO-LR-849
2.5" 0.02"
lafayette 0.4 wsw, co
SNOTEL CO-BO-8
0.57" 0.16"
tabernash 2.7 nw, co
SNOTEL CO-GR-68
18.64" 0.25"
nederland 3.7 ene, co
SNOTEL CO-BO-296
5.81" 0.76"
fort collins 5.5 s, co
SNOTEL CO-LR-1100
2.73" -0.14"
lakewood 2.2 ese, co
SNOTEL CO-JF-179
0.3" 0"
lafayette 2.3 nw, co
SNOTEL CO-BO-290
0.1" 0"
nederland 0.4 wnw, co
SNOTEL CO-BO-322
6.48" 1.21"
boulder 2.1 w, co
SNOTEL CO-BO-437
0.37" 0.21"
highlands ranch 1.1 ene, co
SNOTEL CO-DG-165
0.46" 0"
erie 1.7 wnw, co
SNOTEL CO-BO-285
0.43" 0.11"
greeley 4.6 wnw, co
SNOTEL CO-WE-318
1.27" -0.01"
hygiene,co
SNOTEL HGIC2
1.19" 0.06"
aurora 5 se
SNOTEL AUOC2
0.25" 0"
berthoud
SNOTEL ERTC2
0.57" 0.26"
boulder 2.0 w, co
SNOTEL CO-BO-380
1.79" 0.04"
denver 2.6 ssw, co
SNOTEL CO-DN-231
0.22" 0"
florissant 5.0 n, co
SNOTEL CO-TL-19
0.26" 0"
longmont 5.1 e, co
SNOTEL CO-WE-302
0.13" 0"
carr 0.6 s, co
SNOTEL CO-WE-127
0.15" -0.29"
divide 4nw
SNOTEL DNWC2
0.28" 0"
wheat ridge 0.9 wsw, co
SNOTEL CO-JF-343
0.2" 0"
fort collins 1.2 nne, co
SNOTEL CO-LR-1137
1.71" 0.04"
fcl 1.7 se, co
SNOTEL CO-LR-295
2.57" 0.03"
jamestown 2.5 sse, co
SNOTEL CO-BO-343
0.51" 0.32"
loveland 3.0 nne, co
SNOTEL CO-LR-104
2.04" 0.07"
Glen Cove
SNOTEL 1057
10" 11"
wheat ridge 2.8 wsw, co
SNOTEL CO-JF-290
0.62" 0.2"
denver 2.1 ese, co
SNOTEL CO-DN-25
0.21" 0"
Copeland Lake
SNOTEL 412
23" 4"
dillon 2.3 se, co
SNOTEL CO-SU-16
16.37" 0.29"
lakewood 1.7 sw, co
SNOTEL CO-JF-333
0.47" 0"
wellington 3.7 wnw, co
SNOTEL CO-LR-918
1.24" -0.04"
boulder 2.2 nw, co
SNOTEL CO-BO-452
0.86" 0.14"
niwot 0.7 nnw, co
SNOTEL CO-BO-338
0.96" 0.05"
nunn 1.2 ene, co
SNOTEL CO-WE-345
1.07" -0.14"
fcl 7.9 ene, co
SNOTEL CO-WE-250
0.93" 0"
Jones Pass
SNOTEL 970
38" 0"

Outdoor Recreation

Campground Campsites Reservations Toilets Showers Elevation
Aspen Meadow - Golden Gate Canyon State Park 35 9,000 ft
Narrows 5 6,470 ft
Camp Dick 41 8,716 ft
Pinewood Reservoir 22 6,604 ft
Jacks Gulch 56 8,100 ft
Ansel Watrous 16 5,839 ft
Dutch George 20 6,520 ft
Reverends Ridge - Golden Gate State Park 106 9,105 ft
Lower Narrows 8 6,470 ft
Meadow Park None 5,349 ft
Stove Prairie 9 6,068 ft
Kelly Flats 29 6,751 ft
Kelly Dahl 46 8,615 ft
Olive Ridge 56 8,361 ft
Mountain Park 54 6,678 ft
Peaceful Valley 17 8,552 ft
Hermit Park Open Space None 8,313 ft
Ski Area Snowpack Air Temperature 5 Day Forecast
Eldora Mountain Resort 22" 30° 3.32"
Echo Mountain Park 14" 30° 1.81"
Ski Estes Park (Hidden Valley) 38" 30° 4.17"
River Run Streamflow Length Class
Lower North Fork 54.5cfs 11.0 Mi III
October Hole 15.0cfs None Mi II
Golden Whitewater Park 3.92cfs 0.75 Mi II+
Rustic (Upper) 54.5cfs 20.0 Mi III to III+
Upper Narrows 54.5cfs 0.5 Mi V- to V+
Steven's Gulch to Bridges Take Out 54.5cfs 12.0 Mi III- to IV+
Main Section 47.8cfs 3.0 Mi IV+ to V
Lower Narrows 54.5cfs 0.5 Mi V- to V+
Upper South Boulder Creek 5.57cfs None Mi V+
Upper North Fork 0.2cfs 9.0 Mi IV+ to V-
Idledale to Morrison 21.3cfs 3.0 Mi IV+ to V
Middle Narrows 54.5cfs 1.0 Mi IV to V-
Upper Clear Creek 41.4cfs 2.5 Mi IV- to IV+
Gnar Section 181.0cfs 1.0 Mi V+
Lower Boulder Canyon 40.2cfs None Mi IV- to V-
Tunnel 1 to Golden Whitewater Park 41.4cfs None Mi III- to III+
Filter Plant 3.92cfs None Mi II to III+
SSV - Confluence to Picnic Grounds 15.0cfs 5.0 Mi V to V+
Upper South Boulder Creek 5.57cfs None Mi V+
Filter Plant 3.92cfs None Mi II to III+
NSV 15.0cfs 13.0 Mi V+