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I I I I I FLOOD STAGES, DISCHARGES, AND FLOODED AREAS I Discharge is the rate of flow of a sh'eam, usually expressed in cubic feet per second. Peak discharges were determined at 3 streamflow-gaging stations and 22 miscellaneous sites in the Big Thompson River basin area, and 2 streamflow-gaging stations and 6 miscel- laneous sites in the other flooded parts of Larimer County. The peak discharges and drainage arcas are listed in table 1. The site numbers in the table cor. respond to those on figure 1 and on the plates to aid in locating the sites at which peak discharges were determined. Soon after the flood, higb-water marks were estab- lished and cross-section data were obtained at numerOus locations along tbe Big Thompson River and the North Fork Big Thompson Hiver. Tbese data arc sbown in table 2 for tbe Big Thompson River and in table 3 for the Nortb Fork Big Thompson River. Tbe area flooded on the Big Thompson River from Estes Park to east of Loveland and on the North Fork Big Thompson River from tbe Glen Haven area to Drake were outlined on aerial photographs, scale 1 inch - 200 feet (2.5.4 mm - 61 m) in the canyon area and 1 inch - 400 feet (25.4 mm - 122 m) in tbe Love- land area. These are reproduced as plates 1-.5] for the Big Thompson River and plates NFI-NF15 for the North Fork Big Thompson River. The location of the individual plates arc indicated on fignre 11. The num- bers in boxes,.L[7 shown on some plates indicate the site of tbe pcak discharge in table 1. The number on the plate corresponds to the site number on table l. The numbers (tJ-------(Zl shown on some of the plates indicate the location of hi~h-water elevations and cross-section data shown in tables 2 and 3. The numbers in circles correspond to the site numbers in the tables. I I I I I I I I I I I I I TABLE 1. - Peak discharges, Larimer County, Colo., (Preliminary data - Subject to revision) July 31-August I, 1976 Site no. Station 2 Number N'ame 06735500 Big Thompson River near Estes Park (Iat 400 22' 35", long 1050 29' 06")..... Dry Gulch near Estes Park (Iat 400 24' 22", long 1050 28' 37").................... Dry Gulch <'It Estes Park (Iat 400 22' 42/1, long 1050 29' lS/I)................._.. Big Thompson River below Estes Park (Iat 400 22' 59", long 10So 28' 11")... Big Thompson River tributary below Loveland Heights (Iat 400 23' 44". long 1050 27' 34/1)__ Dark Gulch at Glen Comfort (Iat 400 23' 44", long 1050 26' 17").................... Noels Draw at Glen Comfort (Iat 400 23' 2S", long 1050 26' OO")n............._.... Rabbit Gulch near Drake (lat 400 24' 23", long 1050 24' 17").............n...._ Long Gulch near Drake (Iat 400 23' 46/1, long 10So 24' 04")....... Big Thompson River above Drake (Iat 400 2S' 39", long 1050 20' 37"). _.__........_...._ North Fork Big Thompson River at Glen Haven (Iat 400 27' 17", long 10So 27' OS").,....m.... Fox Creek at Glen Haven (I at 400 27' 17", long 1050 27' 13/1).................... Devils Gulch near Glen Haven (I at 400 26' 24/1, long lOSo 27' 31").............,....._ West Creek near Glen Haven (I at 400 26' 32/', long 10So 27' 40").................... North Fork Big Thompson River tributary near Glen Haven (Jat 400 27' 14", long 10So 26' 04/1)..................._ Black Creek near Glen Haven (lat 400 27' 04", long lOSo 2S' 28/1).. ................. Miller Fork near Glen Haven (Iat 400 27' 47", long 10So 2S' 13").................... North Fork Big Thompson River tributary near Drake (lat 400 26' SS/I, long 10So 24' 11 ").........,.......... North Fork Big Thompson River above Drake (Iat 400 26' 20", long 10So 21' S2/1)n.................. Big Thompson River below Drake (Iat 400 2S' 52/1, long 1050 19' 37/1).................... 06738000 Big Thompson River at mouth of canyon, near Drake (I at 400 25' 18/', long 1050 13' 34"}..,..n............_ Big Thompson River below Green Ridge Glade (I at 400 2S' 05/1, long 10So 12' 02").................... Redstone Creek near MasonvilJe (tat 400 3D' 19", long lOSo 11' 49")... ................ little Thompson River near Estes Park (I at 400 20' 06", long 10So 25' 48/1) ..................' 06744000 Big Thompson River at mouth, near LaSalle (lat 400 21' DO", long 1040 47' 04")..... Dale Creek tributary at Virginia Dale (Iat 40Q 57' 36/1, long 1050 21' 39/1).................._ Deadman Creek near Virginia Dale (Iat 400 SS' SO", long 1050 20' 57") on................ Stonewall Creek near Livermore (Iat 400 48' 37", long 1050 lS' 01")................._. Lone Pine Creek near Livermore (la! 400 47' 44", long 1050 11' 24") ................... North Fork Cache la Poudre River at Livermore (Iat 400 47' is'', long lOSo lS' 08") on................ 067S2000 Cache la Poudre River at mouth of canyon, near Ft. Collins (Iat 400 39' S2", long 1050 13' 26/1).................... Rist Canyon near Bellvue (lat 400 '37' 43/1, long 10So 12' 44/1) 06752260 Cache la poudre River at Ft. Collins (Iat 400 3S' 17", long 10S" 04' 08") ..... _............ (a)No flew out ef Lake Estes. * Not shown an figure 1. 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 *26 *27 *28 *29 *30 *31 '~'32 *33 Drainage area (square miles) lS5 2.00 6.12 164 1.37 l.00 3.37 3.41 1.99 189 18.5 7.18 .91 23.1 1.38 3.17 13.9 1.26 80.2 276 305 311 29.1 2.77 828 .68 23.7 31.9 86.3 539 1,056 5.27 1,129 Date 7-31-76 7.31.76 7-31-76 7.31.76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31.76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 8-1 -76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 7-31-76 10 Discharge (cubic feet per second) (,) 3,210 4,460 4,330 8,700 7,210 6,910 3,540 5.500 28,200 888 1,300 2.810 2,320 9,670 1,790 2.060 3,240 8,710 30,100 31,200 27.000 2.640 1,940 2.500 727 7,400 3,470 2,590 9,460 7,340 2.710 5,700