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
Bear Creek Above Bear Creek Lake Near Morrison
USGS 06710605
7 cfs 3.8 ft
Colorado River Near Granby
USGS 09019500
30 cfs 1.1 ft
St Vrain Cr Blw Boulder Cr At Hwy 119 Nr Longmont
USGS 06730525
128 cfs 9.9 ft
Clear Creek Near Lawson
USGS 06716500
40 cfs 2.7 ft
St. Vrain Creek At Mouth
USGS 06731000
113 cfs 1.3 ft
Grand Lake Outlet Blw Chipmunk Ln At Grand Lk
USGS 09014050
466 cfs 8.6 ft
South Platte R At 64Th Ave. Commerce City
USGS 06714215
9 cfs 1.4 ft
Grand River Ditch At La Poudre Pass
USGS 09010000
-999 cfs 0.0 ft
Moffat Water Tunnel At East Portal
USGS 09022500
13 cfs 0.4 ft
Plum Creek Near Sedalia
USGS 06709000
41 cfs 3.9 ft
Snotel Site Snowpack 24hr Change
windsor 3.8 wsw, co
SNOTEL CO-LR-845
1.73" 0"
lakewood 2.2 ese, co
SNOTEL CO-JF-179
1.41" 0"
westminster 1.6 ne, co
SNOTEL CO-AD-153
1" 0"
fcl 2.55 ne, co
SNOTEL CO-LR-340
2.76" 2.36"
highlands ranch 1.1 ene, co
SNOTEL CO-DG-165
1.96" 0"
fort collins 2.8 w, co
SNOTEL CO-LR-1009
3.93" 3.29"
Berthoud Summit
SNOTEL 335
59" 6"
fort collins 5.4 wsw, co
SNOTEL CO-LR-623
5.32" 4.46"
littleton 6.4 w, co
SNOTEL CO-JF-212
1.44" 1.19"
cripple creek,co
SNOTEL CRIC2
0.07" 0"
loveland 2.3 nw, co
SNOTEL CO-LR-854
4.56" 3.82"
westminster 2.3 sse, co
SNOTEL CO-AD-225
1.17" 0"
south platte river
SNOTEL ANTC2
2.42" -0.32"
greeley 4.6 wnw, co
SNOTEL CO-WE-318
0.65" 0"
broomfield 2.3 ssw, co
SNOTEL CO-JF-72
1.3" 0"
University Camp
SNOTEL 838
55" 4"
hygiene,co
SNOTEL HGIC2
0.66" 0"
red feather 5.9 ne, co
SNOTEL CO-LR-329
5.57" 3.71"
loveland 3.0 nne, co
SNOTEL CO-LR-104
2.07" 1.51"
boulder 1.5 nnw, co
SNOTEL CO-BO-496
1.01" 0"
denver 6.1 wsw, co
SNOTEL CO-JF-3
0.35" 0"
longmont 2.1 n, co
SNOTEL CO-BO-143
0.49" 0"
lov 3.4 s, co
SNOTEL CO-LR-472
2.65" 2.06"
laporte 1.4 nw, co
SNOTEL CO-LR-761
2.93" 2.46"
wellington 0.8 sw, co
SNOTEL CO-LR-1008
1.71" 0"
parker 3.5 wnw, co
SNOTEL CO-DG-292
1.18" 0"
firestone
SNOTEL FSNC2
0.14" 0"
colorado springs 6.9 ne, co
SNOTEL CO-EP-282
0.68" 0"
lake george 7.2 wnw, co
SNOTEL CO-PK-39
1.35" 0.15"
gleneagle 0.4 wnw, co
SNOTEL CO-EP-61
1.02" 0"
fort collins 3.4 n, co
SNOTEL CO-LR-653
2.76" 2.36"
Hourglass Lake
SNOTEL 1122
41" 6"
boulder 2.2 nw, co
SNOTEL CO-BO-452
2.23" 1.87"
rollinsville 1.7 e, co
SNOTEL CO-GL-25
3.69" 2.36"
black forest 6wnw
SNOTEL BKFC2
1" 0"
evergreen 4.2 sse, co
SNOTEL CO-JF-157
4.54" 3.17"
fcl 3.0 sw, co
SNOTEL CO-LR-391
4.4" 3.7"
Bear Lake
SNOTEL 322
57" 8"
highlands ranch 2.5 ssw, co
SNOTEL CO-DG-178
1.9" 0"
castle rock 1.7 ssw, co
SNOTEL CO-DG-62
0.91" 0.89"
estes park 1.8 sse, co
SNOTEL CO-LR-987
6.43" 3.25"
berthoud 4.4 wsw, co
SNOTEL CO-LR-922
3.24" 2.91"
Jones Pass
SNOTEL 970
39" 6"
boulder 1.8 w, co
SNOTEL CO-BO-491
1.53" 1.22"
nederland 3.7 ene, co
SNOTEL CO-BO-296
5.43" 2.94"
nunn 1.2 ene, co
SNOTEL CO-WE-345
2.01" 0"
wheat ridge 2.8 wsw, co
SNOTEL CO-JF-290
0.34" 0"
cabin creek
SNOTEL GCRC2
20.91" 4.1"
fcl 2.2 nw, co
SNOTEL CO-LR-273
3.22" 2.7"
Jackwhacker Gulch
SNOTEL 935
39" 3"
loveland 2.8 wnw, co
SNOTEL CO-LR-1109
4.93" 4.16"
evergreen 2.0 ese, co
SNOTEL CO-JF-395
3.84" 2.77"
fcl 1.7 se, co
SNOTEL CO-LR-295
3.4" 2.91"
parker 2.1 wnw, co
SNOTEL CO-DG-146
0.82" 0"
fort collins 4.9 n, co
SNOTEL CO-LR-1020
2.44" 2.13"
boulder 2.0 w, co
SNOTEL CO-BO-380
1.43" 1.13"
fcl 3.0 w, co
SNOTEL CO-LR-284
3.84" 3.18"
arvada 3.5 wnw, co
SNOTEL CO-JF-457
0.53" 0"
Sawtooth
SNOTEL 1251
63" 4"
nederland 2.61 nne, co
SNOTEL CO-BO-75
6.13" 3.25"
fort collins 1.1 wnw, co
SNOTEL CO-LR-863
3.51" 2.97"
fort collins 5.5 s, co
SNOTEL CO-LR-1100
3.84" 3.27"
evergreen 1.3 nne, co
SNOTEL CO-JF-424
3.68" 2.84"
Wild Basin
SNOTEL 1042
43" 0"
fort collins
SNOTEL FORC2
3.19" 2.72"
thornton 2.1 n, co
SNOTEL CO-AD-100
0.26" 0"
ralston reservoir
SNOTEL GDNC2
2.39" 2.25"
florissant 5.0 n, co
SNOTEL CO-TL-19
0.62" 0.09"
niwot 2.3 w, co
SNOTEL CO-BO-248
0.67" 0"
lafayette 2.5 nw, co
SNOTEL CO-BO-222
0.4" 0"
littleton 6.0 w, co
SNOTEL CO-JF-376
0.26" 0.13"
aspen springs amrad
SNOTEL ASIC2
3.7" 2.65"
boulder 1.9 se, co
SNOTEL CO-BO-30
0.7" 0"
tabernash 2.7 nw, co
SNOTEL CO-GR-68
0.36" 0"
laramie 7sse
SNOTEL CMBW4
0.93" 0.33"
highlands ranch 3.2 ese, co
SNOTEL CO-DG-74
2.17" 0"
estes park 10.5 se, co
SNOTEL CO-LR-1019
9.48" 6.28"
longmont 8.2 ese, co
SNOTEL CO-WE-203
0.12" 0"
Phantom Valley
SNOTEL 688
20" 3"
lyons 0.3 nne, co
SNOTEL CO-BO-146
4.7" 4.13"
lafayette 0.8 wsw, co
SNOTEL CO-BO-266
1.35" 0"
conifer 5.7 sw, co
SNOTEL CO-JF-222
3.78" 1.72"
lafayette 2.3 nw, co
SNOTEL CO-BO-290
1.34" 0"
erie 1.7 wnw, co
SNOTEL CO-BO-455
0.72" 0"
highlands ranch 0.6 sse, co
SNOTEL CO-DG-176
2.03" 0"
broomfield 3.2 nne, co
SNOTEL CO-BR-32
0.69" 0"
Loveland Basin
SNOTEL 602
60" 5"
nederland 0.4 wnw, co
SNOTEL CO-BO-322
5.74" 3.27"
boulder 4.7 e, co
SNOTEL CO-BO-67
0.64" 0"
nederland 4.8 ene, co
SNOTEL CO-BO-110
4.98" 2.77"
grant
SNOTEL GRTC2
7.58" 2.98"
buford 4se
SNOTEL BFDW4
2.6" 2.07"
rollinsville 1.1 ssw, co
SNOTEL CO-GL-17
12.99" 2.67"
erie 1.6 ne, co
SNOTEL CO-WE-209
0.14" 0"
loveland 2.7 e, co
SNOTEL CO-LR-687
1.79" 0"
la porte 10.0 nnw, co
SNOTEL CO-LR-567
3.42" 3.18"
englewood #2
SNOTEL ENLC2
0.54" 0"
lakewood 1.7 sw, co
SNOTEL CO-JF-333
0.47" 0"
Rawah
SNOTEL 1032
23" 6"
fcl 5.6 e, co
SNOTEL CO-LR-393
2.6" 0"
evergreen
SNOTEL EVGC2
3.45" 2.63"
longmont 5.1 e, co
SNOTEL CO-WE-302
0.24" 0"
fcl 7.9 ene, co
SNOTEL CO-WE-250
2.59" 0"
boulder 2.9 s, co
SNOTEL CO-BO-4
0.96" 0"
nederland 4.2 e, co
SNOTEL CO-BO-233
4.68" 2.68"
virginia dale 7.2 ssw, co
SNOTEL CO-LR-672
4.86" 3.73"
longmont 1.8 ene, co
SNOTEL CO-BO-352
0.38" 0"
glen haven 1.2 n, co
SNOTEL CO-LR-868
5.65" 2.58"
cheesman
SNOTEL CHEC2
1.02" 0"
carr 0.6 s, co
SNOTEL CO-WE-127
1.58" 0"
woodland park 1.1 nnw, co
SNOTEL CO-TL-28
0.11" 0.05"
monument 2.1 ene, co
SNOTEL CO-EP-17
1.21" 0"
erie 1.7 wnw, co
SNOTEL CO-BO-285
0.64" 0"
denver 0.4 e, co
SNOTEL CO-DN-175
0.43" 0"
co st forest st park
SNOTEL CSFC2
2.29" 2.25"
allens park 1.5 ese, co
SNOTEL CO-BO-22
12.21" 7.12"
conifer 3.2 sw, co
SNOTEL CO-JF-53
4.5" 2.5"
evergreen 6.5 wsw, co
SNOTEL CO-CC-1
6.02" 4.06"
loveland 1.5 n, co
SNOTEL CO-LR-40
3.95" 3.31"
gross reservoir
SNOTEL GRRC2
2.96" 2.16"
boulder 1.6 s, co
SNOTEL CO-BO-14
1.07" 0.99"
nederland 5.8 e, co
SNOTEL CO-BO-57
4.54" 2.66"
bailey
SNOTEL BLYC2
3.18" 1.1"
estes park 1.8 s, co
SNOTEL CO-LR-767
6.5" 3.31"
Crow Creek
SNOTEL 1045
12" 0"
fort collins 3.9 nne, co
SNOTEL CO-LR-112
2.32" 0"
livermore 9.9 wsw, co
SNOTEL CO-LR-897
5.22" 3.74"
Never Summer
SNOTEL 1031
49" 7"
arvada 4.7 w, co
SNOTEL CO-JF-455
0.5" 0"
aurora 4.0 sse, co
SNOTEL CO-AR-259
0.42" 0"
wellington 3.7 wnw, co
SNOTEL CO-LR-918
1.69" 0"
fort collins 9.6 se, co
SNOTEL CO-LR-630
1.66" 0"
wellington 0.4 nw, co
SNOTEL CO-LR-952
1.7" 0"
fort collins 1.2 nne, co
SNOTEL CO-LR-1137
3.02" 2.59"
monument 3s
SNOTEL DMDC2
0.81" 0"
aurora 5 se
SNOTEL AUOC2
0.49" 0"
denver 8 ssw, co
SNOTEL CO-DN-30
0.99" 0"
estes park,co
SNOTEL ETSC2
5.8" 2.92"
fort collins 2.8 wsw, co
SNOTEL CO-LR-75
4.19" 3.52"
fort collins 4.6 n, co
SNOTEL CO-LR-762
2.53" 2.2"
estes park 3.3 ssw, co
SNOTEL CO-LR-247
7.49" 3.73"
laramie 1se
SNOTEL ADFW4
0.79" 0.21"
Windy Peak
SNOTEL 872
34" -1"
loveland 2.4 nw, co
SNOTEL CO-LR-676
4.56" 3.82"
boulder 2.1 w, co
SNOTEL CO-BO-437
1.53" 1.22"
fort collins 4.2 s, co
SNOTEL CO-LR-758
1.94" 0"
ward 4.6 ne, co
SNOTEL CO-BO-202
11.48" 6.42"
lafayette 0.4 wsw, co
SNOTEL CO-BO-8
1.24" 0"
longmont 1.8 e, co
SNOTEL CO-BO-361
0.34" 0"
aurora south
SNOTEL EAGC2
0.86" 0"
lyons 4.8 n, co
SNOTEL CO-LR-50
6.67" 5.46"
estes park 1.7 w, co
SNOTEL CO-LR-1115
6.41" 2.99"
cr66
SNOTEL GEYC2
0.62" 0"
longmont 3.3 sw, co
SNOTEL CO-BO-507
0.51" 0"
boulder 1.5 wnw, co
SNOTEL CO-BO-490
1.41" 1.17"
fort collins 3.7 s, co
SNOTEL CO-LR-885
3.81" 3.26"
cheyenne wfo
SNOTEL CYSW4
1.95" 1.65"
aurora 2.1 ese, co
SNOTEL CO-AR-313
0.5" 0"
jamestown 2.5 sse, co
SNOTEL CO-BO-343
6.12" 3.61"
fort collins 0.9 n, co
SNOTEL CO-LR-849
3.15" 2.71"
longmont 3.0 sw, co
SNOTEL CO-BO-435
0.48" 0"
evergreen 5 w, co
SNOTEL CO-CC-2
5.48" 3.83"
Michigan Creek
SNOTEL 937
36" 0"
evergreen 3.4 wnw, co
SNOTEL CO-CC-22
5.47" 3.88"
georgetown
SNOTEL GEOC2
4.14" 2.84"
windsor 3.0 sse, co
SNOTEL CO-WE-507
1.01" 0"
erie 1.5 nne, co
SNOTEL CO-WE-511
0.16" 0"
Willow Park
SNOTEL 870
58" 3"
boulder 4.7 ene, co
SNOTEL CO-BO-220
0.55" 0"
amrad
SNOTEL CNRC2
5.56" 3.34"
bellvue 5.9 w, co
SNOTEL CO-LR-4
5.28" 3.53"
fcl 1.7 sw, co
SNOTEL CO-LR-320
3.97" 3.34"
Copeland Lake
SNOTEL 412
10" 4"
niwot 0.7 nnw, co
SNOTEL CO-BO-338
0.55" 0"
fcl 2.3 nw, co
SNOTEL CO-LR-311
3.29" 2.75"
berthoud
SNOTEL ERTC2
1.63" 1.33"
golden 12.5 nw, co
SNOTEL CO-JF-331
3.71" 2.56"
fort lupton 7.4 nw, co
SNOTEL CO-WE-326
0.11" 0"

Outdoor Recreation

Campground Campsites Reservations Toilets Showers Elevation
Kelly Flats 29 6,751 ft
Stove Prairie 9 6,068 ft
Pinewood Reservoir 22 6,604 ft
Reverends Ridge - Golden Gate State Park 106 9,105 ft
Mountain Park 54 6,678 ft
Hermit Park Open Space None 8,313 ft
Ansel Watrous 16 5,839 ft
Narrows 5 6,470 ft
Jacks Gulch 56 8,100 ft
Olive Ridge 56 8,361 ft
Peaceful Valley 17 8,552 ft
Aspen Meadow - Golden Gate Canyon State Park 35 9,000 ft
Lower Narrows 8 6,470 ft
Camp Dick 41 8,716 ft
Kelly Dahl 46 8,615 ft
Dutch George 20 6,520 ft
Meadow Park None 5,349 ft
Ski Area Snowpack Air Temperature 5 Day Forecast
Echo Mountain Park 31" 22° 12.94"
Eldora Mountain Resort 26" 26° 14.44"
Ski Estes Park (Hidden Valley) 57" 27° 14.19"
River Run Streamflow Length Class
Upper Narrows 56.4cfs 0.5 Mi V- to V+
Steven's Gulch to Bridges Take Out 56.4cfs 12.0 Mi III- to IV+
Lower Boulder Canyon 50.8cfs None Mi IV- to V-
SSV - Confluence to Picnic Grounds 55.4cfs 5.0 Mi V to V+
Rustic (Upper) 56.4cfs 20.0 Mi III to III+
Lower North Fork 72.4cfs 11.0 Mi III
Idledale to Morrison 23.7cfs 3.0 Mi IV+ to V
Upper Clear Creek 49.5cfs 2.5 Mi IV- to IV+
Upper North Fork 69.7cfs 9.0 Mi IV+ to V-
Upper South Boulder Creek 11.0cfs None Mi V+
Middle Narrows 56.4cfs 1.0 Mi IV to V-
Gnar Section 141.0cfs 1.0 Mi V+
October Hole 55.4cfs None Mi II
Tunnel 1 to Golden Whitewater Park 49.5cfs None Mi III- to III+
NSV 55.4cfs 13.0 Mi V+
Filter Plant 1.66cfs None Mi II to III+
Filter Plant 1.66cfs None Mi II to III+
Lower Narrows 72.4cfs 0.5 Mi V- to V+
Upper South Boulder Creek 11.0cfs None Mi V+
Golden Whitewater Park 1.66cfs 0.75 Mi II+
Main Section 46.8cfs 3.0 Mi IV+ to V