Main Section


Run from below the Gnar Section to Idylwilde Dam.

Suggested river levels for paddling this section of the Big Thompson are between a bare minimum of 300cfs and a high of 1,100cfs. River conditions sourced from USGS 06660000, the Laramie River At Laramie Remember only watercraft are permitted at Main Section.

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Area Hydrology

Gauge Streamflow Stage
First Cr Ab 96Th Ave
USGS 06720480
1 cfs ft
South Platte River At Waterton
USGS 06708000
50 cfs 0.7 ft
Michigan River Near Cameron Pass
USGS 06614800
1 cfs 2.3 ft
St. Vrain Creek At Mouth
USGS 06731000
96 cfs 1.4 ft
Clear Creek At Golden
USGS 06719505
41 cfs 3.5 ft
Plum Creek Near Sedalia
USGS 06709000
15 cfs 3.6 ft
Fraser River At Upper Sta
USGS 09022000
2 cfs 0.5 ft
Big Dry Creek Blw C-470 At Highlands Ranch
USGS 06710150
2 cfs 1.7 ft
South St. Vrain Creek Near Ward
USGS 06722500
4 cfs 1.5 ft
Grand River Ditch At La Poudre Pass
USGS 09010000
-999 cfs 0.3 ft
Snotel Site Snowpack 24hr Change
lakewood 1.7 sw, co
SNOTEL CO-JF-333
0.47" 0"
fcl 1.7 se, co
SNOTEL CO-LR-295
2.57" 0.03"
Jones Pass
SNOTEL 970
38" 0"
parker 3.5 wnw, co
SNOTEL CO-DG-292
0.37" 0"
englewood 1.4 n, co
SNOTEL CO-AR-292
0.26" 0"
Loveland Basin
SNOTEL 602
43" 2"
University Camp
SNOTEL 838
37" 5"
conifer 3.2 sw, co
SNOTEL CO-JF-53
2.19" 0.53"
gleneagle 0.4 wnw, co
SNOTEL CO-EP-61
0.25" 0"
niwot 2.3 w, co
SNOTEL CO-BO-248
1.85" 0.2"
berthoud 4.4 wsw, co
SNOTEL CO-LR-922
1.94" 0.39"
Hourglass Lake
SNOTEL 1122
30" 4"
broomfield 3.2 nne, co
SNOTEL CO-BR-32
0.09" 0"
Niwot
SNOTEL 663
28" 5"
longmont 2.1 n, co
SNOTEL CO-BO-143
1.21" 0.2"
loveland 3.0 nne, co
SNOTEL CO-LR-104
2.04" 0.07"
evergreen
SNOTEL EVGC2
2.36" 0.11"
dillon 2.3 se, co
SNOTEL CO-SU-16
16.37" 0.29"
Phantom Valley
SNOTEL 688
26" 1"
littleton 6.0 w, co
SNOTEL CO-JF-376
0.99" 0.56"
Copeland Lake
SNOTEL 412
23" 4"
fort collins 4.6 n, co
SNOTEL CO-LR-762
0.99" -0.05"
arvada 3.5 wnw, co
SNOTEL CO-JF-457
0.15" 0"
fort collins 2.8 w, co
SNOTEL CO-LR-1009
2.89" 0.09"
erie 1.7 wnw, co
SNOTEL CO-BO-285
0.43" 0.11"
littleton 6.4 w, co
SNOTEL CO-JF-212
0.66" 0"
highlands ranch 0.6 sse, co
SNOTEL CO-DG-176
0.5" 0"
boulder 2.0 w, co
SNOTEL CO-BO-380
1.79" 0.04"
estes park 1.8 sse, co
SNOTEL CO-LR-987
1.4" 0"
fcl 3.0 sw, co
SNOTEL CO-LR-391
2.75" 0.1"
High Lonesome
SNOTEL 1187
50" 2"
boulder 1.5 wnw, co
SNOTEL CO-BO-490
3.94" -0.28"
fcl 1.7 sw, co
SNOTEL CO-LR-320
3.18" 0.08"
nederland 0.4 wnw, co
SNOTEL CO-BO-322
6.48" 1.21"
boulder 1.9 se, co
SNOTEL CO-BO-30
0.71" 0.15"
fort collins 2.8 wsw, co
SNOTEL CO-LR-75
2.39" 0.09"
wheat ridge 2.8 wsw, co
SNOTEL CO-JF-290
0.62" 0.2"
wellington 0.8 sw, co
SNOTEL CO-LR-1008
1.49" -0.11"
greeley 4.6 wnw, co
SNOTEL CO-WE-318
1.27" -0.01"
longmont 3.3 sw, co
SNOTEL CO-BO-507
0.06" 0"
hygiene,co
SNOTEL HGIC2
1.19" 0.06"
lyons 4.8 n, co
SNOTEL CO-LR-50
3.09" 1.2"
Berthoud Summit
SNOTEL 335
39" 5"
fcl 7.9 ene, co
SNOTEL CO-WE-250
0.93" 0"
boulder 4.7 e, co
SNOTEL CO-BO-67
0.7" 0.15"
lafayette 0.4 wsw, co
SNOTEL CO-BO-8
0.57" 0.16"
lafayette 2.5 nw, co
SNOTEL CO-BO-222
0.65" 0.14"
fort lupton 7.4 nw, co
SNOTEL CO-WE-326
0.11" 0"
wellington 0.4 nw, co
SNOTEL CO-LR-952
1.52" -0.12"
Bear Lake
SNOTEL 322
38" 3"
boulder 1.6 s, co
SNOTEL CO-BO-14
0.87" 0.18"
thornton 2.1 n, co
SNOTEL CO-AD-100
0.62" 0.2"
loveland 2.8 wnw, co
SNOTEL CO-LR-1109
2.58" 0.11"
lake george 7.2 wnw, co
SNOTEL CO-PK-39
0.23" 0"
erie 1.7 wnw, co
SNOTEL CO-BO-455
0.08" 0"
woodland park 1.1 nnw, co
SNOTEL CO-TL-28
0.13" 0"
denver 3.2 sse, co
SNOTEL CO-DN-49
0.56" 0.17"
fort collins 5.4 wsw, co
SNOTEL CO-LR-623
0.26" 0"
black forest 6wnw
SNOTEL BKFC2
0.22" 0"
Crow Creek
SNOTEL 1045
13" 0"
arvada 4.7 w, co
SNOTEL CO-JF-455
0.22" 0"
erie 0.5 se, co
SNOTEL CO-WE-392
0.07" 0"
evergreen 2.0 ese, co
SNOTEL CO-JF-395
1.94" 0.24"
estes park 3.3 ssw, co
SNOTEL CO-LR-247
1.36" 1.1"
estes park,co
SNOTEL ETSC2
1.8" 1.1"
lov 3.4 s, co
SNOTEL CO-LR-472
3.03" 0.19"
fort collins 3.9 nne, co
SNOTEL CO-LR-112
4.66" 0.04"
evergreen 3.4 wnw, co
SNOTEL CO-CC-22
1.81" 0.17"
cabin creek
SNOTEL GCRC2
12.95" 1.67"
denver 6.1 wsw, co
SNOTEL CO-JF-3
0.28" 0"
arvada 2.1 sse, co
SNOTEL CO-JF-427
0.16" 0"
denver 2.1 ese, co
SNOTEL CO-DN-25
0.21" 0"
nederland 2.61 nne, co
SNOTEL CO-BO-75
4.94" 0.09"
evergreen 1.3 nne, co
SNOTEL CO-JF-424
2.29" 0.07"
fcl 3.0 w, co
SNOTEL CO-LR-284
2.17" 0.13"
Windy Peak
SNOTEL 872
16" 3"
fort collins 0.9 n, co
SNOTEL CO-LR-849
2.5" 0.02"
erie 1.6 ne, co
SNOTEL CO-WE-209
0.45" 0.15"
bailey
SNOTEL BLYC2
1.21" -0.11"
wheat ridge 0.9 wsw, co
SNOTEL CO-JF-343
0.2" 0"
rollinsville 1.1 ssw, co
SNOTEL CO-GL-17
10.62" 1.72"
tabernash 2.7 nw, co
SNOTEL CO-GR-68
18.64" 0.25"
rollinsville 1.7 e, co
SNOTEL CO-GL-25
4.14" 1.3"
boulder 1.8 w, co
SNOTEL CO-BO-491
0.37" 0.21"
niwot 0.7 nnw, co
SNOTEL CO-BO-338
0.96" 0.05"
loveland 2.4 nw, co
SNOTEL CO-LR-676
2.65" 0.11"
highlands ranch 3.2 ese, co
SNOTEL CO-DG-74
0.48" 0"
georgetown
SNOTEL GEOC2
3.7" 0.73"
longmont 5.1 e, co
SNOTEL CO-WE-302
0.13" 0"
boulder 4.7 ene, co
SNOTEL CO-BO-220
0.75" 0.11"
laporte 1.4 nw, co
SNOTEL CO-LR-761
0.87" 0.11"
windsor 3.0 sse, co
SNOTEL CO-WE-507
1.05" -0.01"
Echo Lake
SNOTEL 936
14" 7"
allens park 1.5 ese, co
SNOTEL CO-BO-22
10.71" 1.74"
nederland 3.7 ene, co
SNOTEL CO-BO-296
5.81" 0.76"
arvada 3.8 w, co
SNOTEL CO-JF-240
0.15" 0"
boulder 1.5 nnw, co
SNOTEL CO-BO-496
0.13" 0"
carr 0.6 s, co
SNOTEL CO-WE-127
0.15" -0.29"
aspen springs amrad
SNOTEL ASIC2
2.09" 0.55"
glen haven 1.2 n, co
SNOTEL CO-LR-868
1.54" 1.08"
red feather 5.9 ne, co
SNOTEL CO-LR-329
1.14" -0.66"
amrad
SNOTEL CNRC2
2.32" 0.25"
estes park 1.8 s, co
SNOTEL CO-LR-767
5.11" 1.2"
Grizzly Peak
SNOTEL 505
44" 4"
buford 4se
SNOTEL BFDW4
1.88" -0.46"
denver/stapleton
SNOTEL DUAC2
0.21" 0"
estes park 1.7 w, co
SNOTEL CO-LR-1115
7.25" 1.18"
Rawah
SNOTEL 1032
28" 3"
aurora 5 se
SNOTEL AUOC2
0.25" 0"
windsor 3.8 wsw, co
SNOTEL CO-LR-845
0.42" 0.04"
co st forest st park
SNOTEL CSFC2
20.08" 0.08"
nederland 4.2 e, co
SNOTEL CO-BO-233
5.14" 0.09"
fort collins 3.4 n, co
SNOTEL CO-LR-653
0.75" 0.08"
boulder 2.2 nw, co
SNOTEL CO-BO-452
0.86" 0.14"
fort collins 1.2 nne, co
SNOTEL CO-LR-1137
1.71" 0.04"
laramie 1se
SNOTEL ADFW4
2.39" -0.04"
aurora south
SNOTEL EAGC2
0.27" 0"
fort collins 5.5 s, co
SNOTEL CO-LR-1100
2.73" -0.14"
cheesman
SNOTEL CHEC2
0.48" 0.09"
wellington 3.7 wnw, co
SNOTEL CO-LR-918
1.24" -0.04"
cr66
SNOTEL GEYC2
1.1" 0"
fcl 2.2 nw, co
SNOTEL CO-LR-273
2.7" -0.19"
loveland 2.3 nw, co
SNOTEL CO-LR-854
2.65" 0.11"
broomfield 2.3 ssw, co
SNOTEL CO-JF-72
1.43" 0.12"
fort collins 1.1 wnw, co
SNOTEL CO-LR-863
1.96" 0.06"
boulder 2.9 s, co
SNOTEL CO-BO-4
0.95" 0.15"
Glen Cove
SNOTEL 1057
10" 11"
lafayette 0.8 wsw, co
SNOTEL CO-BO-266
0.65" 0.17"
conifer 5.7 sw, co
SNOTEL CO-JF-222
0.83" 0.08"
lyons 0.3 nne, co
SNOTEL CO-BO-146
1.74" 0.62"
denver 0.4 e, co
SNOTEL CO-DN-175
0.22" 0"
loveland 2.7 e, co
SNOTEL CO-LR-687
1.57" 0.07"
loveland 1.5 n, co
SNOTEL CO-LR-40
3.07" 0.06"
nederland 4.8 ene, co
SNOTEL CO-BO-110
4.91" 0.74"
monument 2.1 ene, co
SNOTEL CO-EP-17
0.92" 0.06"
englewood #2
SNOTEL ENLC2
0.31" 0"
longmont 3.0 sw, co
SNOTEL CO-BO-435
0.05" 0"
denver 1.1 ne, co
SNOTEL CO-DN-280
0.22" 0"
boulder 2.1 w, co
SNOTEL CO-BO-437
0.37" 0.21"
cripple creek,co
SNOTEL CRIC2
1.69" 0.94"
south platte river
SNOTEL ANTC2
0.21" 0"
virginia dale 7.2 ssw, co
SNOTEL CO-LR-672
0.41" -0.34"
longmont 8.2 ese, co
SNOTEL CO-WE-203
1.92" 0.17"
ralston reservoir
SNOTEL GDNC2
0.41" 0"
highlands ranch 1.1 ene, co
SNOTEL CO-DG-165
0.46" 0"
fort collins
SNOTEL FORC2
2.34" 0.03"
cripple creek 5.1 nw, co
SNOTEL CO-TL-16
0.47" 0"
nunn 1.2 ene, co
SNOTEL CO-WE-345
1.07" -0.14"
fcl 2.55 ne, co
SNOTEL CO-LR-340
0.75" 0.08"
castle rock 1.7 ssw, co
SNOTEL CO-DG-62
0.61" 0"
westminster 1.6 ne, co
SNOTEL CO-AD-153
1.11" 0.19"
evergreen 5 w, co
SNOTEL CO-CC-2
1.78" 0.16"
golden 12.5 nw, co
SNOTEL CO-JF-331
5.33" 0.27"
westminster 2.3 sse, co
SNOTEL CO-AD-225
0.61" 0.35"
aurora 4.0 sse, co
SNOTEL CO-AR-259
0.25" 0"
berthoud
SNOTEL ERTC2
0.57" 0.26"
la porte 10.0 nnw, co
SNOTEL CO-LR-567
0.8" 0.08"
fcl 2.3 nw, co
SNOTEL CO-LR-311
0.84" 0.01"
fort collins 3.7 s, co
SNOTEL CO-LR-885
1.36" 0.09"
estes park 10.5 se, co
SNOTEL CO-LR-1019
3.02" 1.15"
ward 4.6 ne, co
SNOTEL CO-BO-202
8.03" 0.91"
grant
SNOTEL GRTC2
2.46" 0.06"
bellvue 5.9 w, co
SNOTEL CO-LR-4
0.93" -0.15"
longmont 1.8 ene, co
SNOTEL CO-BO-352
0.08" 0"
monument 3s
SNOTEL DMDC2
0.23" 0"
aurora 4.2 nnw, co
SNOTEL CO-AD-127
0.22" 0"
highlands ranch 2.5 ssw, co
SNOTEL CO-DG-178
0.56" 0"
laramie 7sse
SNOTEL CMBW4
3.19" -0.12"
fort collins 9.6 se, co
SNOTEL CO-LR-630
1.82" 0.06"
evergreen 6.5 wsw, co
SNOTEL CO-CC-1
1.95" 0.08"
florissant 5.0 n, co
SNOTEL CO-TL-19
0.26" 0"
fort collins 4.9 n, co
SNOTEL CO-LR-1020
2.13" -0.18"
lafayette 2.3 nw, co
SNOTEL CO-BO-290
0.1" 0"
fcl 5.6 e, co
SNOTEL CO-LR-393
1.53" 0.08"
longmont 1.8 e, co
SNOTEL CO-BO-361
0.3" 0.14"
thornton 2.3 sse, co
SNOTEL CO-AD-22
0.08" 0"
aurora 2.1 ese, co
SNOTEL CO-AR-313
0.26" 0"
divide 4nw
SNOTEL DNWC2
0.28" 0"
parker 2.1 wnw, co
SNOTEL CO-DG-146
0.32" 0"
fort collins 4.2 s, co
SNOTEL CO-LR-758
2.81" 0.08"
jamestown 2.5 sse, co
SNOTEL CO-BO-343
0.51" 0.32"
gross reservoir
SNOTEL GRRC2
1.58" 0.25"
denver 8 ssw, co
SNOTEL CO-DN-30
0.34" 0"
firestone
SNOTEL FSNC2
0.1" 0"
greeley 2.6 w, co
SNOTEL CO-WE-171
1.77" -0.1"
lakewood 2.2 ese, co
SNOTEL CO-JF-179
0.3" 0"
evergreen 4.2 sse, co
SNOTEL CO-JF-157
2.01" 0.7"
denver 2.6 ssw, co
SNOTEL CO-DN-231
0.22" 0"
nederland 5.8 e, co
SNOTEL CO-BO-57
7.67" -0.38"

Outdoor Recreation

Campground Campsites Reservations Toilets Showers Elevation
Mountain Park 54 6,678 ft
Narrows 5 6,470 ft
Ansel Watrous 16 5,839 ft
Stove Prairie 9 6,068 ft
Kelly Dahl 46 8,615 ft
Pinewood Reservoir 22 6,604 ft
Flatiron Reservoir None 5,483 ft
Hermit Park Open Space None 8,313 ft
Reverends Ridge - Golden Gate State Park 106 9,105 ft
Lower Narrows 8 6,470 ft
Dutch George 20 6,520 ft
Kelly Flats 29 6,751 ft
Meadow Park None 5,349 ft
Peaceful Valley 17 8,552 ft
Ski Area Snowpack Air Temperature 5 Day Forecast
Echo Mountain Park 14" 30° 1.81"
Ski Estes Park (Hidden Valley) 38" 30° 4.17"
Eldora Mountain Resort 22" 30° 3.32"
River Run Streamflow Length Class
Middle Narrows 54.5cfs 1.0 Mi IV to V-
Main Section 47.8cfs 3.0 Mi IV+ to V
Filter Plant 3.92cfs None Mi II to III+
Filter Plant 3.92cfs None Mi II to III+
Upper South Boulder Creek 5.57cfs None Mi V+
Upper South Boulder Creek 5.57cfs None Mi V+
Upper North Fork 0.2cfs 9.0 Mi IV+ to V-
Gnar Section 181.0cfs 1.0 Mi V+
Lower Narrows 54.5cfs 0.5 Mi V- to V+
SSV - Confluence to Picnic Grounds 15.0cfs 5.0 Mi V to V+
Tunnel 1 to Golden Whitewater Park 41.4cfs None Mi III- to III+
Golden Whitewater Park 3.92cfs 0.75 Mi II+
October Hole 15.0cfs None Mi II
NSV 15.0cfs 13.0 Mi V+
Upper Narrows 54.5cfs 0.5 Mi V- to V+
Rustic (Upper) 54.5cfs 20.0 Mi III to III+
Lower Boulder Canyon 40.2cfs None Mi IV- to V-
Upper Clear Creek 41.4cfs 2.5 Mi IV- to IV+
Idledale to Morrison 21.3cfs 3.0 Mi IV+ to V
Steven's Gulch to Bridges Take Out 54.5cfs 12.0 Mi III- to IV+
Lower North Fork 54.5cfs 11.0 Mi III