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UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Altitude (Feet) 7,800 7,600 7,400 7,200 7,000 7,800 7,600 7,400 7,200 7,000 Altitude ( Feet I 7,600 7,400 7,200 7,000 6,800 6,600 7,000 6,800 6,600 6,400 6,200 6,000 5,800 5,600 5,400 5,800 5,600 5,400 5,200 5,000 4,800 5,000 4,800 4,600 OL YMPUS DAM DRY GULCH I DEBRIS FAN 1.0 LOVELAND HEIGHTS UNN AMED GULCH DEBRIS FAN DEBRIS FAN 1.8 LOCAL REWORKING OF SANDY TO PEBBLY ALLUVIUM River Mile 57 LONG GULCH '\ MAJOR SIDE CUTTING SANOY TO eOBBL'< CHANNEL FilL MOSTLY MICACEOUS SCHIST 49 LOVELAND POWERPLANT I I 2.6 EXTENSIVE SCOUR ALONG NARROW AND CONFINED FLOODWAY ROAD FLOODWAY- CHANNEL SCOUR S. FILL LARGE BOULDERY GRAVEL BAR FAULT ZONE GNEISS AND SCHIST 41 2.2 LONG GULCH RABBIT GULCH MAJOR OVERBANK I DEPOSITION . I ,I SANDY TO COBalY r- CHANNEL FILL I - MAJOR LATERAL CUTTING AT ~ OUTSIDES Of BENDS MIJDR LATERAL CUTTING AT OUTSIDES OF BEND SANDY TO COBBLY CHANNEL FILL SANDY TO PEBBLY CHANNEL FILL S L V E R PLUME GRANITE BOULIER CREEK GRAN 00 lOR IT E MOSTLY MICACEOUS SCHIST 56 55 54 53 52 51 50 7.2 TRUE GULCH WALTONIA I SULLIVAN GULCH I \ (UNNAMED GULCH II DRAKE (INTERSECTION ROUTES 34 a 103) I I 32 31 30 BOULDERY GRAVEL BARS NORTH FORK BIG THOMPSON RIVER ( i 4.7 2.0 MIDWAY INTENSIVE SCOUR L'XT'NSIV' SCOUR EXTENSIVE PEBBLY TO COBBLY GRAVEL DEPOSITED ALONG RELATIVELY STRAIGHT FLOODWAY BOULDERY GRAVEL BARS INTENSIVE SCOUR COBBLY TO BOULDERY GRAVEL BARS GNEISS INTRUDED BODIES AND SCHIST BY MANY LARGE OF PEGMATITE ATERAL SCOUR, ESPECIALLY ALONG OUTSIDES OF BENDS WITH DEPOSITION OF BQULDERy GRAVEL BARS COVERED WAGON RESTAURANT AREA 48 47 46 45 BOULDERY GRAVEL BAR NARROW AND CONFINED FLOODWAY EXTENSIVE SCOUR FAULT ZON E GNEISS AND SCHIST CEDAR CREEK I ~ROUSE II HOLLOW DICKSON GULCH I I f---THE 2.4 NARROWS 44 43 42 WIDESPREAD DEPOSITION OF PEBBLY SAND IN BROAD FLOODWAY, LOCAL SCOUR ALONG MEANDERING CHANNEL MOUTH OF BIG THOMPSON CANYON DAM I GREEN RIDGE GL~DE I I I BUCKHORN CREEK I I BOULDERY- COBBLY BEDLOAD DEPOSIT AT UPSTREAM END OF BROAD FLDDDWAY INTENSIVE SCOUR WITHIN NARROW AND CONFINED FLOODWAY FA ULT GNEISS AND SCHIST EXTENSIVE LATERAL CUTTING OF CHANNEL BANKS AND WIDESPREAD OVERBANK DEPOSITION OF SAND AND SILT AND LOCALLY COARSER MATEf;IAL ~ GRANITE PALEOZOIC AND MESOZOIC ROCKS ZONE 40 39 38 37 35 34 DRY CREEK I I 36 TAFT AVENUE ! I US ROUTE 287 \ EXTENSIVE LATERAL CUTTING OF CHANNEL BANKS AND WIDESPREAD OVERBANK DEPOSITION OF SAND AND SILT AND LOCALLY COARSER MATERIAL RIVER AT GRADE - UNDERLAIN BY PALEOZOIC AND MESOZOIC ROCKS AND UNCONSOLIDATED OUATERNARY DEPOSITS 29 28 27 26 River Mile 33 A, Profile of the Big Thompson River from Olympus Dom to U, $, Highway 287 showing generalized bedrock conditions and principal flood effects GLEN HAVEN FOX CREEK DEVILS GULCH I ( I NO EVIDENCE OF SiG- NIFICANT EROSION OR DEPOSITION-- GRANITE REWORKING OF CHANNEL ALLUVIUM AND OVERBANK DEPOSITION OF SANDY DEBRIS GNEISS AND River Mile 10 DEVILS SCHI S T 9 GULCH WEST CREEK I NORTH FOR~' I GLEN HAVEN INTENSIVE SCOUR 1---- WIDESPR'AD DEPOSITION OF ------+--- PEBBLY SAND GNEISS AND SCHIST SILVER PLUME GRAN ITE 2 "U,S. GOVERNMENT PRINTING OFFICE \979-677-026/4 PIPER MEADOWS DRAINAGE I DUNRAVEN GLADE MILLER FORK EXTENSIVE SCOUR ALONG NARROW AND CONFINED FLOODWAY I PEBBLY SAND ~ ALLUVIAL FAN 6,800 WIDESPREAD DEPOSITION OF PEBBLY SAND IN BROAD FLOODWAY, LOCAL SCOUR ALONG MEANDERING CHANNEL 6,600 6,400 6,200 6,000 GNEISS AND SCHIST o 8 6 7 B Profile of Devils Gulch and North Fork Big Thompson River from showing generalized bedrock conditions Glen and Vertical exoggeroVon 10 X EXPLANATION ~7.2-Avefage intermediate diameter,in d feet,of largest boulders transported by the flood ~ables 7 and 8) GA LUCH IE GULCH INTENSIVE SCOUR ALONG NARROW AND CONFINED fLDODWAY- PEBBLY SAND / ALLUVIAL FAN EXTENSIVE SCOUR ALON G INTERMEDIATE FLOODWAY. DEPOSITION OF BOULDER- COBBLE - GRAVEL BARS 11 S- \ PROFESSIONAL PAPER 1115 PLATE 3 BOBCAT GULCH I DRAKE STATE FISH HATCHERY I WIDESPREAD DEPOSITION OF PEBBLY SAND IN BROAD FLOODWAY; SCOUR LIMITED TO LOCAL AREAS OF CONFINED CHANNEL AND OUTSIDES OF BENDS GNEISS AND SCHIST INTRUDED BY MANY LARGE BODIES OF PEGMATITE FAULT GLEN COMFORT DARK GULCH DEBRIS FAN~ I NOELS DRAW 3,6 _........... I 5 3 2 4 Haven to principal the confluence flood effects with the Big Thompson STREAM PROFILES OF BIG THOMPSON RIVER AND NORTH FORK BIG THOMPSON RIVER, COLORADO Z 0 N E River Mile o Stream profiles prepared by P. W. Schmidt Geology of bedrock and surficial deposits mod- ified from Braddock,Calvert,and others (19701. Braddock, Nutalaya, and others (19701, Colton (19781. and Tweto (19761 Flood effects by R. R Shroba,P,W. Schmidt. and E.J Crosby