FLOOD05381

• County: Larimer
• County: Weld
• Stream Name: Big Thompson/Cache la Poudre
• Basin: South Platte
• Title: Storm and Flood of July 31-August 1, 1976 in the Big Thompson River and Cache la Poudre River Basins
• Date: 1/1/1979
• Prepared For: Colorado Geological Survey
• Floodplain - Doc Type: Drawing/Map

11S-1

UNITED STATES DEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEY

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EXPLANATION

LandsHdes-lncludes rockslides (RS) and debris slides (DS)

EROSION AND DEPOSmON ALONG MAIN STREAMS

Minor to moderate channel scour wlthin ftoodway of Big Thompson River.
Intensive scour testricted 10 outsides of relatively sharp bends and areas
along constricted reaches. Channel deposits range from sand to boulder
gravel; overbank sand to pebbly sand occurs locally. Colored areas repre-
sent approximate extent of flooding

Widespread deposition of sand to pebbly sand. 1ncludes some sman deposits
of pebbly to cobbly gravel. East of Big Thompson Canyon to South Platte
River, overbank sediments are dominantly sand, grading dOONnstream to
dominantly silt

rme stipple Indicates areas of widespread deposition of pebbly to cobbly
gravel; includes some smaD deposits of pebbly sand and cobbly to bouldery
gravel. Coarse stipple indicates wldespread deposition of cobbly to boul.
dery gravel; includes some sman deposits of pebbly 10 cobbly gravel

Local areas of intense lateral scour

Extensive channel scour within lI00dways 01 Big Thompson River and North
Fork; deposition of cobble to boulder gravel. Bouldery grave] bars com-
mon. especlanyalong insides of bends. Overbank sands to boulder gravels
occur locaUy. Calmed areas represent approximate extent of flooding. Roe
stipple Indicates areas of widespread deposition of cobbly to bouldery
gravel; Includes some small deposits 01 pebbly to cobbly gravel. Coarse
stipple Indicates wldespread deposition of bouldery gravel; includes some
smaD deposits of cobbly 10 bouldery gravel

Intensive channel scour throughout 1I0<Xlway 01 Big Thomp6Orl River; local
deposition of cobbly to bouldery gravel. Much of the sandy to bouIdery
material scoured from the channeJ was deposited farther downstream along
reaches with lower gradients. Overbank sands to boulder gravels occur
locaUy, Colored areas represent approximate extent of flooding. Coarse
stipple indicates local deposition of bouldery gravel

Segments of highway severely eroded or destroyed by 1l0<Xlwater

Boulder-measurement site-Number after letter B corresponds to river
mileage of site. Sizes of largest boulders are summarized In tables 7 and 8 in
text

Peak-discharge measurements (In cubic feet per second) by Water Resources
Division of the U.S. Geological Survey

Isohyets (in inches) for July 31-August 2. 1976 stonn. slightly modified from
unpublished data provided by the Natlonal Wealher ServIce

Mileage marker-lndicates distance In miles along riverbed

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Base from U.s. Geological Sl.My,
DIiKe. 1962JohnsIalvn. 1950. photore'iised 1969;
!Lwli/llt 1!&),,MoID'ewisad 1969: Masonville.
1962.photorevised 1971; Milliktm. 1950. photorevised
1969;andWIOOSOl,1950,photorevised1969

U'

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52'30"
C, BIG TIlOMPSON RIVER, EAST OF LOVELAND TO CONFLUENCE WITH TIlE SOUTH PLAnE RIVER

'-""''''-

"

SCALE 1:24000
o
>---I I

1 MILE

G

Flood e-ffects east of the mountain front
mepp8(l byE.J CI()sby.1976. Flood effect in
BiQ Tlonpson Canyon meppad by PW. Sctlmic!t
3fldR.R.Shroba.1976,

-

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1 .5 0
-----

1 KILOMEtER

.U.s..GOVl_NT""""'''''OP''OL'',.....l1~.

CONTOUR INTEllVAI. 10 AND <lO FEET
oorrro lINES REl'1lESOO 20.fQOT CONTOOlS
NATIONAL GEOOETt VERTIC:Al QATW Il' 1929

GEOLOGIC AND GEOMORPHIC EFFECTS OF THE 1976 STORM AND FLOOD, BIG THOMPSON RIVER AREA, COLORADO

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