UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

MAP SHOWING LANDSLIDES AND RELATIVE SLOPE STABILITY OF QUATERNARY

DEPOSITS OF THE LOWER SKAGIT AND BAKER VALLEYS, NORTH CASCADES

WASHINGTON

By

Paul L. Heller

Open-File Report

79-963

This report is preliminary and

has not been edited or reviewed

for conformity with Geological

Survey standards or nomenclature

MAP SHOWING LANDSLIDES AND RELATIVE SLOPE STABILITY OF QUATERNARY

DEPOSITS OF THE LOWER SKAGIT~AND BAKER VALLEYS, NORTH CASCADES,

WASHINGTON

by Paul L. Heller

Appendix A Landslide Data

Data for landslides lettered on the.landslide location map is given in the following table. Landslides are listed sequentially by the six characters used to locate the slides on the landslide location map (example: 36-8-15A

36 = 36 North

8 = Range 8 East

15 = Section 15

A = label found on landslide in section 15).

Information given includes:

SLIDE TYPE

DATA SOURCE - codes are:

FLIGHT CODE SCALE YEAR OWNER

1

2

3

= CWD-R

= NW-69

= NW-C-76

1:20000

1:12000

1 : 24000

1956

1969

1976

Agricultural Stability and Conservation Service (USDA)

Washington State Department of Natural Resources

Washington State Department ofNatural Resources

4 = On site investigation 1976-1977

WIDTH - width at widest part of slide (usually slide's head) in meters.

LENGTH - slide length in meters. * denotes slide and fTowage length combined.

SLOPE - in degrees. Codes are: A = estimated from air photo (within 5 )

B - measured on site

C = estimated on site (within 5 )

D = minimum slope angle

VRT = near vertical slope

Appendix A (Cont.)

AREA - minimum area which failed in square meters. If length is * then value equals the minimum area which failed plus the minimum area damaged by slide debris.

CAUSES - factors contributing towards slope failure, presented in order of decreasing importance. Codes are:

A » ground water perched at impermeable boundary

B = steep slope angle

C = stream undercut

D = failure of previous landslide debris

E = loading

F = road construction, cutting and filling

6 » deforestation

DAMAGE - damage done to:

D = drainage

R = road

P = property

SLIDE I.n.

SLIDE

DATA

WIDTH

LENGTH

SLOPE. AREA

CAUSES

DAMAGE

TYPE

> 35-5-11 -A

DEBRTS

1 2?

*159FLOW

'1 '

B

1 35-5-13-A

DSBRJ8

1 45

?2 27

| '

FLO'*!

. '

1 .

L B

> 35-5-13-A

DEBRIS

* 15

30 22

D -

FLOW

ii '

'' -

- B

i 35-5-13-0

SLUMP 4

20 5

26

i

P

35-5-13-C

DEBRIS

1 <<$

45

30 FLOW

t

3510

IMAYUE NOT A

SLIDE.

510 R

SEE OH

SITE

INVESTIGATION.

CROWN AT

OLD ROAO.

750 A,D,F

R,d

2 OLD SLIDES HAVE

TAKEN PLACE MERE.

OLD ROAD DEBRIS IN

SLIDE.

F R

DEBITS SPILLS O^

TO PT.

20 . WOAO

AT GROWN OF

SLIDE.

1S30

CROWN AT

POWER

LINE CUT.

35-5-14-A SLUMP

FLOWV*

830

60 F.A

DIRT ROAD /ABOVE

SLIDE CKQWN.

AUIQW HORE WATER

TO SATURATE SLIDE

AREA.

i '

i)i *.., . «

|!i ' lr-

5! ai

SL2.OCJ

u> C5<£ 2.<c0

COUJCO

<c u

1!

! < ! UJQl<T

1 U.1 £. i ^_i __

v:

\ r

! c j =*U._/

x

c

i »u_c. -ca-

^- ~

1 <IC i ccr

i

Lu CU.

^i CC»-

C

«| Ij fau

C»

-Jer

r <U1

0UJ<foo-

>»-* 2i03-J'jLj^0)-3 »u.CJ^Oa<UlLUUJOCJCO2t-0 3C/)UJ

o«r-.

rvi<M

in ^>

».

tn -* ccSCDO Ul_' OU.

«t1 car

1<c

1inro

i

0

o CO

oo=o

CO ru

^c

cO rvi

fO

^3:-*%r0

X. 213

<.1

LOO

14>Iin"0

r"»-)-J -»

<u.*~t

> -J»-&v> O<tUl

CJQCUJ 1 =32DUI-J>O«-<r» ^ 2.eou,

-

»^*^

orOe? "

CO 45

in

to-^-ui cto CDt-* Ul_>oen

<i

COO

143

1l/>to

1t^

~^-c^ -»»^5UlQ

«t

uJ3?

K ISCDO »-_J 2U-

c?O* "

fOra

»«

rJ in

a. 2:^30_J_J</JU_

<c .1o»

149

1mi*7

oz i - 4tCTl/> UJC-ZQtCCtujf- JcoXt/7

ui?oo oU OLU 5s »UJ£il>OOSU--Ji:«toi-_jUIOJ23?O.C&U.IUCD

.o

ex.

o%

CD

o>0in ~

IPcr

<

m

ra

K)

- -

cri-UJ CfO

«2D»-- Ul_i OCO

CO1o*

143

1in_^tafO

\ t- ox0*-

«al<.00flfoJt-a*."3 .

CPiOu* *-odce -4C9 _fOuJ cocto

od

CO -

u.

otoow

»

.>-*3C

>

cO fU

?

"5

<n.»-*ut ao

S3O07

-*1 ^

143

1mP>

SLTOF T.n.

SI.IHF OATA

WIDTH LFvniH

sLOpr AREA

CAUSES DAMAGE

COWFA/T FYPF

SOURCE

&35-6- 23-A

DEBRIS' 3

85 99

40 5180

8,C SLIDE

35-6-23-B

HEBRTSl

3 l 85

31 ?080

B,C SL1.DE

|f

1 0

35-6-23-C

DEBRIS

3 ?5

31 40

780 B,C

SLIDE

D 35-6-27-A

DEBRIS 1

61 ??

40 1390

8.C SLIDE

i onjnrw; ROAD AT

HEAD OF SLIDE.

DAMAGED IF

FUTURE

FAILURE.

I QGHTMr; PQAD AT

HEAD OF SLIDE.

. DAMAGED IF

FUTURE

FAILURE.

i i

UNDERCUT BY

STREAM.

35-6-28-A

DEBRIS

SLIDE1

1i45200

6.CUNDERCUT BY

STREAM. SLIOE AT

EDGE. OF TERRACE.

SLIDE i.o.

SLT.DF DATA

WIDTH LENGTH

SLOPE AREA

CAUSES DAMAGE

COMMENTTYPE

SOURCE

D 35-6-2Q-B

DEBRIS

? 192

56 45

6960

B.C

AVALANCHE

35-7-01-A

DEBRIS

j ,»

45 91

3600

SLIDER

35-7-02-A

DEBRIS

1 1 llf

22

35

2600

* SLIDE

3S-7-02-8

DEBRIS

1 91

6&

5^0

B,C

SLIDE

ii

i

B 35-7-02-B

DEBRIS

^

50

C.8

SLIDE

UNDERCUT. BY

STREAM. SLIDE AT

EDGE OF TERRACE.

LANDSLIDE A/H.A.

DATA FOR A

SINGLE

/MEMBER.

J LANDSLIDE ARFA

JUST BELOW TERRACE

EDGE. CAUSFD BY

ROAD CUT ?

a SMALL RECENT

SLIDES WITHIN THIS

LANDSLIDE AREA

UNDERCUT BY

STREAM.

STREAM UNDERCUTS

BANK, MATERIAL

SPALLS OFF.

,..,>

301

is

v IO

N a9

Avtf

on

n i

MO

ldd.

wms

v-9o

-z-S

f

NV

N

Qd

iQ

Naa

nsoN

viV

flQd

VIV

O9

09

60

1

Off

99

a3Q

11S

51^9

30

9--h

O-A

-bf

Ban

sN

V ^ V

ION

NV

lV

l\/a

i O

SS

tl

Ot7

(6a

3Q

HS

S

Idfl3

CJ

Oft

ahns

JO

QV

3Hxv

\f3

ui

aans

aiM

Vl

3H3N

V1V

AV

30V

WV

OH1

0N31

H

i.om

vi

va3d

Ai

sons

a'i

san

s

SLTDF T.D

SLIDETYPE

DMA

SOURCE

W]D

SLOPE

AREA

CAUSES

DAMAGE

COMMENT

35-7-09-A

3550

35A,B

RUYLE SLIDE.

DEBRIS AVALANCHt

r?) AT

TERRACE

EDGE. SLUMP BLOCKS

f?1 ALSO.

35-7. 10-A

SLIDE8

4I6

3?15060

6LNDSLIDE AKEA

35-7-2?. A

/H7?0

F,B

35-7-24-A

DEBRIS

SLIDE

9tA

50 ^0

32X0

DATA ON

LARGEST OF

4- SLIDES AT

LOCATION.

DEBRIS

SLIDE

D34

30750

APEA MAY HAVE BEFAl

PREVIOUSLY LOGGED.

35-8-02-A

SLUMP

30070

35 !'

C'F.A

P.RLOWER BAKEP DAM

SLIDE.

POWEP

MOUSE DESTROYED.

TREMENDOUS

**i > p»»

SLIDE T.D.

SLIOF

OAIA

VTDTH

IFMRTM

SI OPE

APFA

CAUSFS

DA^AGF. .

. TYPF

SOMRCF

35-8-03-A

35-8-05-A

35-8-05-0

35-8-07-A

35-a-U-A

DEBRIS 1

91 68

40 SLIDE

UNKNOWN 1

« t

, «

DEBRIS 1

SLIDE

' *

D DEBRIS

2 27

48 20

FLOW

B SLUMP

I 4

90 90

36

FLOW

. r-

8 LANDSLIDE AREA AT

VERY STEFP HEAD OF

STREAM GULLY.

2 SMALL

RECEHT

! j

SLIDES WITHIN THIS

' LANDSLIDE.

AREA-

t030 MAYBE SOME OTHEH

/ TYPE.

OF LANDSLIDE.

'

A.F R

FLOWED ON TO ROAD

QELQW.

35-8-11-8FLOW

1120

590 A

AL FLOWED

STREAK

GULLIES.

SLIDE 1.0.

SLIDF

TYPF

HATA

VI1DTH

LFMRTM

S1.HPF SOURCE

ARFA

CAUSES

35-8-1 1-C

35-8-1 1-D

35-8-1 i-A

35-8-ia-B

35-8-1 a-C

D MUD

3 57

71 25

FLOW

MUD

3 28

37

* D

MUD

1 fc

6ft 20

FLOW

A DEBRIS

1 30

FLOW

* A

SLUMP

3 85

1\15 30

FLOW

M

28-10 A

D

520

A D

270

MATERIAL FLOWED

DOWN STREAM

r '. GULLIES.

i

LANDSLIDE AREA.

SFFM TQ BE

, /"UDFLOWS.

>

30160

A R.D

WUD FLQV«E.O

ON TO

RT. 20 SEVERAL

TIMES DURIMG HEAVY

RAINS IN

1976.

35-8-13-ASLIDE

1550 B

UNDERCUT BY

STREAM.

' &

SLIDE I.D.

SI.IDF '

TYPF

DATA

WIDTH

LENfUH

SLOPF

AREA

SOURCE

CAUSES

DAMAGE

35-8-16-A

DEBRIS SLIQE

250VRT

10900

DATA FOR LANDSLIDE

ARFA. AN

AR

TIF

TC

TA

l I. Y S

TfcT

P

SLO

PE

fQ

UA

RR

Y).

35-8-16-Afi

450S

LO

PE

H

AD

B

EE

N

DU

RIN

G

RO

AD

C

ON

ST

RU

CT

ION

.

CU

T

35-8

-16-B

D

EB

RIS

S

LID

E17

35AREA HAD OEEN

LOGGED. MAY BE

SIDE-CAST CPILL1

FAILURE.

]

35-8-16-C

QFRRTS

SLIDE

35AT

VFRY STEEP HEAD

OF STRFAM

, TW

PREVIOUSLY LOGGtD

AUFA.

35-8-16-D

SLUM-P FLOW

35

LANDSLIDE. AREA.

vmno

JO OVdH d33iS

OhU

MOld

V-ZI-0-SC

3HDNV1VAV

tOVH UUV

rJ33fU UVH VddV

Q

HO'U

3-91-9-SC

OVM

0 OSI7

9130

lib*

'U3U001

AlSOOlAddd W339

OVH V3dV 3

0ilb

' dO

OV3K IV

i iNfl

SN01V

b'O

b 02

30J.

1S

,Siti

H3

G3-9

1-8

-SC

S3

SII

VJ

Jd

U'lS

H

itJN

Jl

ViV

Uu*

i aa

ns

SLIDE T.D.

SLIDF

DATA

WIDTH

LFNRIH

SLMPF

ARFA

CAIISFS DAMAHF

TYPF

SOURCE

3S-8-17-B

35-8-1 7-C

35-8-17-D

35-8-31-A

35-8-P2-A

D DEBRIS

3 28

57

35

1600

B,C

FLOW

i i

»

DEBRIS^

3 30

B.C FLOW

, t

DEBRIS

1 45

B»F

R SLIDE

D DEORTS

2 128

1b ^0

2050

B,C

SLIDE

DEBRIS

Z

C.B

SLIDE

DERRIS FLO

1" AUE.A

AT HFAH OF

DRAINAGE..

I

MAYRF ONLY

A SIDE-CAST CFtLU

FAILURE.

UNDERCUT QY

STREAM.

LAWOSLIOE AKEAUNDERCUT 8Y

STREAM.

35-a-aa-B DEBRIS

i SLIDE.

91 sa

UNDERCUT BY

STREAM.

SUD

E i.o

. SLID

F HATA

WIDTH

LFNGTH

SLOPE. TYPF

SOHRCFCAHSFS

£>AMA(;E: CDNMFMT

35-8-H2-C

35-8-22-D

35-8-2^-A

35-8-23-A

35-8-33-8

35-8-23-C

DEBRIS

1 6

* 91

270

FLOW

DEBRIS

a

16 43

690SLIDE

', *

* D

DEBRIS

1 11

91 20

590

8,C

FLO*

B DEORTS

4

10 12

26 A

FLOW

ii B

DEBRIS

4

10 15

33 A

RFLHW

|»

BDEBRIS

a 128

136 42

M97Q

A.O AVALANCHE

FLOWED DOWN STREAM

GULLY.

ARFA HAD BEEN

LOfiGED AND HAD

SUSTAINED ROAD

CONSTRUCTION.

1 AVERAGE SIZE OF 4

SLIDES OCCURRING

IN THESF STREAM

GULLIES.

MANY OLD SLIDES AT

THIS SITE.

ORIGINATES AS A

DEBRIS-SLIDE OR

AVALANCHE, BECOMES

FLOW IN

STRHANV GULLY.

L3L3J&S

.35JSJB

aJR

B,«

JB e e

t

SLID

E

T.O

. STYPF

OATA W

IDTH LFM

GTH SLQ

Pf SOURCE

AR

FA

C

AIIS

FS

D

AM

AR

F.

,35-ft-2*-c

QEURTS 4

150A

VA

L.A

AIC

HL

42B.C

DATA FQW UANDSLTOfc.

AREA COMTATN1MG

BOTH DEBRIS-SLIDES

AMD DEQRTS FLOWS.

3S-S-23-D

OEBRTS,

SLI'OE *

8LAWDSLTOE AT

VLRV

STEEP HEAD OP

STREAM GUt.LY.

35-8-2"*-E

35-8-23-F

35-8-23-G

UNKNOWN

2.

DEQR1S

1 SLIDE

DEBRIS

1 ?

. FLHW;

, i

! LANOSLTDE ARFA AT

VEPY ST£EP HEAO OF

STREAM GULLY.

LANDSLIDE AKEA.

D 2

22 35

250 B,C

35-6-23-H

DEBRIS

FLOW

1 I500

a

>* It'

: T.O.

SLIDE QATA

WIDTH LENGTH

SLOPF AREA

CAUSES DAMAGE

COMMENT TYPE

SOURCE

35-8-33-1

DEGRTS

1 136

VRT F,B

SLIDE

35-A-P3-J

DEHRIS

1 1

22* 45

30 640

SLIDE »

ft

35-8-24-A

DEBRIS

1 91

91 5290

FLOW

8 35-ft-?4-A

SLUMP

a

9b 64

38

4100 A

FLOW

8 35-a-24-A

SLUMP 4

76 19

38 A.

FLOW

i--

LANOSL IDE AREA,

VEPTTCAI LY CUT

Cl 1FFS IN

SAND AND

GRAVEL.

AREA HAH RFFA1

LOGGED. CWO'^w

AT TERRACE EDGE.

i

CROWN TS

.AT A

DIRT

POAO.

CPOWN tSATAOIRT

^ ROAD.

35-8-E4-8

gFS51S

FL U"M

SLIDES ni

LANDSLIDE AREA.

MIGHT

BEL DEBRIS-SLIDES.

SL

IDE

T

.D.

SI.ID

K

TY

PF

DA

TA

IV

TD

TH

L'E

NO

TH

S

I HP

F

AR

FA

C

AIIS

FS

O

AM

AR

F

DE

BR

ISFLOW

32L 20-

58

0

35-8

-25-A

DE

UR

TS

S

LID

E76

MAY BE

IMTTTATE.D BY

LQAHTMG WITH

FTLL f?TDE CA

DEBRIS

1 AVALAMCHF

DE13R

TS 1

SLIDEV

RT

F.B

35.9,30-A

DEBRIS

SLIDE

TOP OF SLIDE

AT TERRACE

EDGE.

35-9.33-A

DEBRIS

to 10

60C

ULV

ER

T

AT

HE

.A&

O

F S

LID

E

CO

NC

EN

TR

AT

ES

V

*AT

EW

. R

OA

D

MA

Y

OE

D

AM

AG

ED

.

SHOP

T.I). SLTHF

DATA

VITDTH LENGTH

SLOPE

ARFA

CAUSES

DAMAGE

COMMENT

TYPF.

* A

36-7-31-A

SI UMp (.

1 qs

22 30

510FLOW

* '

* D

36-7-33-A

DFRRTSfl 1

129 91

40 8480

SLIDE ,.

* .!

36-7-33-8

DEBRTS

1 91

SLIDE

3f»-7-33-C DEBRIS

1 342

34 11700

SLIDE

i1A

36-7-35-A

DEBRIS

1 273

40 B.C

SLIDE

;

A36-7-36-A

DEBRTS

' t

27 91

40 2^60

B SLIDE

*

CROWN JUST BELOrt

TERRACE LIP.

UNDERCUT BY

STREAM.

i,MAYBF MOT

A SLIDE.

i.lNDKRCMT (?).

BYSTREAM.

>LANDSLIDE ARFA

UNDERCUT BY

STREAM.

UNDERCUT BY

STREAM. SLIDE AT

EDGE OF

TFRRACF.

3 LANDSLIDES

|N AREA STEEPENED BY

STREAM. AREA

DEEM PREVIOUSLY

LUGGED.' b

SLIDE T.D.

SLiriF DATA

WIDTH

LENGTH

SLOPF

AREA

TYPF

SONRCF

36-7-36-B

UNKNOWN

2 4.0

30 1090

f

3&-7-3h-C

DFBPTS

1 £

k SLIDE

|

3fr-8-01-A DEBRIS

1 6&

66 3080

FLOW

(3 3*-8-01-A

SLUMP

2 208

192 27

36860

FLOW

1 8

36-8-Dt-A

SLUMP

.4 304

60 27

! Fl O

W

3^-Q-OI-B

QE8RTS

2 48

48 ISaO

FLOW

CAUSES

DAMAGE

COMMENT

,i >

'

LANDSLIDE ARFA

WHICH HAD Of EN

PREVIOUSLY LOOfoEO.

1 .

'A

' : ! LATER FAILED BY

SLUMPING (?).

SMALL DEBRIS FLOW

NEXT TO THIS ONE.

A D

APEA HAD BEEN

PREVTOUSl Y

LOGGED.

A,C

D ARE A

HAD BEEM

PREVIOUSLY LOGGED

FLOWED DDWN STRE.^^A

GULLY.

i

OS

SLIDE 1.0.

SLIDE

DATA

WIDTH

LENGTH

SLOPE

TYPE

SOURCE

36-8-01-C

DEBRIS .8

16 64

SLIDE

'

, 1

' 36-8-01-0

SLUMP

;; 4

f FLOW

.

C 36-8-01-E

DEURTS

4

15 35

30 SLIDE

1

36-8-01-F

DERPTS

i 1.

91 91

FLOW ;

1 '

-D 'i

! 36-8-02-A

DEBRIS

1 159

91 35

SLIDE

i -

AREA

CAUSES

DAMAGE

COMMENT

t . .

770

MAYBF SOME OTHFfc

TYPE OF

LANDSLIDE.

AREA HAD BEEN

PREVIOUSLY LOGGED.

A AREA HAD BEEN

LOGGED AMD HAD

SUSTAINED ROAD

CONSTRUCTION.

1

E.G,A

LANDSLIDE AREA,

SQME SLUMPS f?).

DATA FOR

AVERAGE: i

DEBRIS-SLIDE.

/

6300

A

10850

B.C

FLOWED OONN STREAM

CULLY TO

LAKE.

SLIDE l.D.

SLIDE

DATA

WIDTH

LENGTH

SLOPE

AREA

CAUSES

DAMAGE

COMMENT

TYPE

SOURCE

36-8-02-8

36-8-1 1-A

36-8-12-A

36-8-12-A

36-8-12-Q

DEBRIS

1FLOW

i; '

B UNKNOWN'

4 35

MAYBE NOT

A SLIDE.

i

1 !

iD

DEBRIS

2 56

40 20

2080 NEW

SLIDE BUT AN

FLOW OLD SCAR

is ALSO

VISIBLE.

j

DEBRIS

1 4-5

34

1150FLOW

i

UNKNOWN

'2

16 16

' 260

OLD SCAR

VISIBLE. IN

LOGGED AREA.

36-8-12-C

DEBRIS

FLOW

3 22

25 35

280 A,G

AREA HAD BE'EK1

LOGGED PRIOR TO

SLIDE.

SLID

E

1.0

. S

UD

E

DA

TA

W

IDT

H

LE

NG

TH

S

LO

PE

T

YP

EAREA

CAUSES

DAMAGE

COMMENT

1 36-&-1Z-C DEOKIS

£ FLOW

\.. -

~T~~f ------------------------------------------------ """

c36-S-13-A

SLUMP

<(. 150

18 35

?700 A.U

FLOW

36-8-13-Q

DEBRIS

1 FLOW

36-8-13-C

DEBRTS

1 1iq.

91 7E50

SLIDE

A 36-8-13-D

DEBRIS

1 20

20 45

390

SLIDE

ARFA MAY HAVE BEEN

ARKA HAD BEEN

LOGGED AMD HAD

SUSTAINED ROAU

(CONSTUUCT1QN.

MAYBE ONLY

A 4

jo SIDC-CAST (FILL>

/ A

FAILURE.

UNDERCUT OY

STREAM, (^AYQE

SOME

OTHER LAMOSLTOE.

TYPE.

UNDERCUT RY

STREAM.

SLIDE T.D.

SLIDE

DATA

WIDTH

LENGTH

SLOPF

AREA

TYPE

SOURCE

CAUSES

DAMAHE

COMMENT

SLUMP

320

17656330

C,B

UNDERCUT BY

STREAM. SLIDE AT

EDGE OF

T6RKACE.

36-8-13-F

UNKNOWN

* 1

LANDSLIDE AREA

' *'

VERY STEEP MEAD

STREAM GULI.Y.

AT OF

C '

.' '

36-8-1<l-A SLUMP

4 IE

5 30

A.Q.G

'OTMFP SIMILAR

FLOW

LANDSLIDES NEAR

BY, AREA MAY HAVE

BEEN PREVIOUSLY

LOGGED.

i

DEBRIS

1 FLOW

7930

8870LANDSLIDE AT

LAKE

LEVEL. MAY HAVE

FORMERLY BEEN

UNDERCUT BY

STREAM.

36-8-14-C

UNKMOWN

LANDSLIDE AREA,

1 t*

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SLIDE J.D.

SI IDE AT

WT0

LENGTH

SLOPE

AREA CAUSES

DAMAGE

COMMFNT

,I Y

t,

36-8-23-C

UNKNOWN,, 1

LANDSLID

f

36-8-23-D

DEBRIS

* 2

VRT

POSSIBLY

SLIDE. *

SLIDE. M

CUT. .

* i i

D !

! 36-8-2<l-A

DEBRIS

1 182

57 35

10370

B.A

FORMERLY

SLIDE

CHANNEL.

IS LAKE

36-a-2<l-B UNKNOWN

1 .22

,57 1250

E AREA.

NOT A

IGHT OE

A

A STREAM

PRESENTLY

36.8-2M-C

SLUMP FLOW

25OCCURS AT

LAKE

LEVLL. WATER

PERCHED BY

LAKE ?

36-6-24-D

UNKNOWN

; 2

12& 128

13310LOGGING ROAD AT

HEAD OF

SLIDE,

DAMAGED IF

FUTUWE. FAILURE.

SLIDE T.D. SLIDE.

DATA WIDTH

LENGTH SLOPE

AREA CAUSES

DAMAGE COMMENT

TYPE.. SOURCF.

36-8-2q-E

DEBRIS '*

2 16

16 260

SL IDE, *

^ '

36-8-26-A

DEBRIS

1

68 22

780 B.C

SLIDE

t

* A

36-8-26-B

DEBRIS

1 68

68 25

3860

A FLOW

'

'

36-8-26-C

DEBRIS

2SLIDE

,i D

36-8-26-D

DEBRIS

2 96

32 30

2^30 G,C

SLIDE

1 i

! '

' '

R

1 36-8-28-A

DEBRIS ^

50 65

40 F'A.B

!/

SLIDE

FAILURE OCCUR«ED

ALONG POWER LIME

CUT.

UNDERCUT BY

STREAM.

OCCURS AT

LAKE

LEVEL . WATER

PERCHED OY

LAKE ?

LANDSLIDE AREA

WHICH HAD BEEN

PREVIOOSU L06G£b.'

UNDERCUT

liY STWEAM.

ROAD AT

HEAD.

SIDE-CAST (FILL)

FAILURE MAY HAVE.

TRIGGERED SLIDE.

1| SLIDE T.O.

SLIDE

DATA

WIDTH

LENGTH

SLQPfe 1

. TYPE

SOURCE,

3f>-8-31-A DEBRIS,

1 j

SLIDE /

I *

,

36-8-31-B

DEBRIS

2. 272.

80 40

SLIDE/

'

C 3&-8.3q./y

DEBRIS

4

US 600

50 SLIDE

j 36-8-34-B

DEBRIS

1 159

91 SLIDE.

1

36-B-34-C

DEBRIS

! 1

a? 50

\

SLIDE

i ".'

36-8-34-D

DEBRIS

1 114

1H

SLIDE

AREA

CAUSES

DAMAGE

COMMENT

i > »

F f\

LANDSLIDES IN

AREA STEEPENED BY

ROAD CUT.

*

1 1200

8 LANDSLIDE ARFA

AIH1CH HAD RFFN

I !

20000

C.a

0 DATA FOR LANDSLIDE

AHEA AT VEOY ST^EP

HEAD OF STRtAM

GULLY.

0*

7aso 8

1350

13000

DATA FOR

A LANDSLIDE AREA,

NQT FOR AW

INDIVIDUAL SLIDE.

SLIDE l.D.

SLIDE

DATA

WIDTH

LENGTH

Sl.OPt AREA

CAUSES

DAMAGE

COMMENT

TYPE

, SOURCE

' .( a

36-8-35-A

DEBRIS

4 30

bO 30

G.B

SLIDE

S6-a-35-8

DESR1S

3 SLIDE.

-i

36-9-06-A

DEBRIS

1 AVALANCHE

j 36-9-07-A

DEBRIS

Z a«8

?5 4010

B.FLOW

t

u

36-9-07-8

DEBRIS

a 3a

64

t020

6 FLOW

TRO^JM IS

AT

TERWACE EDGE. AREA

HAD BEEM

PREVIOUSLY LOGG&O.

AREA MAY HAVE B£EN

PREVIOUSLY LOGG&O.

LANDSLIDE AREA

WHICH HAH KEEN

i PREVIOUSLY LOC<i£C>.

/

DATA FOR

LANDSLIDE AREA,

AtOVER

STEEPENED HEAD

OF STREAM

GULLY.

OCCURS INSIDE AREA

SLIDE T.D.

SLTHE

DATA WIDTH

LENGTH

SLOPE

TYPE SOURCE

AREA CAUSES

DAMAGE

COMMENT

36-9-18-A

36-9-18-0

37-9-31-A

A ' f

DEBRIS

£ 16

48 560

FLOW

* i

/

' D

DEBRIS

2 96

64 40

5630

B SLIDE

'. '

1

DEBRIS

Z lia

FLOW

MAYBE SOME OTHER

TYPE OF LANOSL TOE.

AREA HAD BEtM

PREVIOUSLY LOGGED.

LOGGING ROAD AT

HEAD OF SLIDE,

DAMAGED IF

FUTURE

FAILURE.