HomeMy WebLinkAbout113-97 - Res. Interim Measure to Prohibit Construction in the Skokomish River Valley RESOLUTION NO.
IN THE MATTER OF:
Enacting an interim measure which will prohibit all new construction in the Skokomish River
Valley where there is a threat to life and property due to a potential river avulsion. This,resolution
shall be in effect for a period of six months from the date of approval on an interim basis, under
authority of Chapter 36.70A.390; and
WHEREAS, the Mason County Board of Commissioners on July 15, 1997, adopted Resolution
No. 76-97, a Declaration of Emergency for several bodies of water in Mason County, including
the Skokomish River; and
WHEREAS, portions of the Skokomish River and Vance Creek are perched, that is the river
channel is higher than the surrounding floodplain creating a condition which, coupled with the
continued aggradation and loss of flow conveyance capacity in the river, makes it probable that an
avulsion will take place and the river will develop a new channel on the flood plain; and
WHEREAS, it is impossible to predict when an avulsion may take place during a flood event; and
WHEREAS, recent floods have eroded significant areas of riparian vegetation and riverbank,
breached dikes and present a continued threat to life and property; and
WHEREAS, any new construction within the Skokomish River Valley within the 100-year
floodplain defined below is potentially in danger of being in the path of a river avulsion; and
WHEREAS, the prohibition of building for the next six months will provide additional time and
opportunity to further evaluate the potential threat of an avulsion and examination of alternatives
for dealing with the situation without allowing other structures to be constructed in harms way,
and
WHEREAS, reconstruction or replacement shall be for structures of the same type and use as the
original structure and shall within the original footprint; and
WHEREAS, per orders from the Western Washington Growth Management Hearings Board,
Mason County is in the process of amending the Frequently Flooded Areas section of the Interim
Resource Ordinance No. 77-93 and this moratorium will allow for time to consider whether or
not the proposed density of 1 dwelling unit per 5 acres is appropriate in the Skokomish River
floodplain; and
WHEREAS, the resolution is to promote the public health, safety, and general welfare, and to
minimize public and private losses by prohibiting any new construction within the Skokomish
River Valley,
RESOLUTION NO. 113-97
NOW THEREFORE, BE IT RESOLVED BY THE BOARD OF COUNTY
COMMISSIONERS:
Construction of any new structure, as defined in the Flood Damage Prevention Ordinance#59-91,
shall not be allowed in the Skokomish River Valley within the 100-year flood plain of the
Skokomish River as delineated in the Skokomish River Comprehensive Flood Hazard
Management Plan, February 199 7; and the I 00-year flood plain of Vance Creek and the South
Fork Skokomish River within Sections 1, 2, 3, 4, 9, 10, 11, 12, 13, Township 21 N., Range 5 W,
W.M. as delineated on the Flood Insurance Rate Map (530115 0001-0175), May 17, 1988. Maps
delineating these areas are attached hereto as "Exhibit N' and "Exhibit B", respectively, and made
a part of this resolution by reference. A site inspection will be conducted for any development
proposals in the previously described areas to verify if it is within the 100-year floodplain.
Reconstruction shall be allowed pursuant to all applicable regulations and the following condition:
1. The area of the footprint of the structure following reconstruction shall be no greater than
the areas of the footprints prior to reconstruction. A footprint is defined as the total area
of the first floor of a structure, regardless of how the structure is supported.
This resolution is in effect for six (6) months beginning on the date of approval by the Mason
County Board of Commissioners.
DATED this 29-) day of i 1997.
BOARD OF COUNTY COMMISSIONERS OF
MASON COUNTY, WASHINGTON
C h�a#
A� ATTEST:
C missioneff
Clerk of the Board
Commissioner
f3 IT
................
JOINSPANELOI-25
ELEVATION REFERENCE MARKS KEY'
NA 50(,Year Flood Boundary—
OLYMPIC NATIONAL REFERENCE ELEVATION
MARK (FT.NGVD) DESCRIPTION OF LOCATION
I 0(iYear Flood Boundary
FORE 33
6 32 RIM15 32,0 U.S.Route 101 bridge crossing slough. Xin corner of bridge
. 3 0 31
curb on the north bank Of the upstream side of bridge,approxi. Zo.e Designations
T22 N m8tchf 0.03 miles 115a)southerly of the intersection with BOUF-
gault East.
T22N
T21 N RM23 31.'4 PK and shinner on the centerline of the Skokomish Valley Road, 10(!Year Flood Boundary--
T21 N approximately 0.29 miles(1,520')north and approximately 0.49
50(,iYear Flood Boundary—
miles(2,5901)vvest of the Intersection with Bourgault VVest,or
approximately 0.78 miles along the centerlina of the Skokomish Ba Flood Elevation Line
Valley Road, a Wi Elevation In Feet**
RM25 38.5 PK and shinner on the centarline of the Skokomish Valley Road,
e Flood Elevation in Feet
approximately 1.43 miles westerly of the intersection with Bour- Ba I' i
W�re Uniform Within Zone*�
gault I'Vest along said centerline.
RM31 48.1 61
PK and shinner on the centarline of the Skokomish Valley Road,' Eldat on Reference Mark
pproximately 2.17 miles westerly of the intersection with Bour-
gault West,along said centerline. Zoi c D Boundary—
RMr Mile
ROSE L�KE **I eferenced to the Nati
onal
E LANATION OF
XP
ZINE E
5 4 LU
ZONE C
.0 Areas of 100-yeai
0 flood hazard factor:.
AO Areas of 100-vc,;,,-
are between one
of inundation are
are determined.
ZONE C
'N;4 EXHIBIT A
Areas of 100-ye,!
/H
Skokomish Indian Reselvat'
Are between one
AREA NOT I elevations are shv�-
are determined.
N NO GEM NCLUD�D
RES""OU "T10 //3 �7 Al A30 Areas of I 00-year
ZONE C flood hazard factot
auxw9 Areas of 100-yc�,.
protection systvn'.
elevations and flo
Areas between lin-.
year flood;or cert
ZONE C ing with average dr�
the contributing(I
mile;or areas prot,
(Medium shadi gl
Areas of minimal 1:
Areas of
undetern
it Areas of I 00-yeai
A
action);base flood
not dete rm inc
VI�V30 Areas of 100-veae
A-7
action);base flood
A I determined.
FLOD L
NOTES
Ce.ri.-lin areas not in the special-
may be protected by flood cont
This map is for use in adminisi
M Program;it does not necessaril-
Ag, "I
P'll,
Il 111-0
g
45 ing,4 particularly from local di.-
7 8 9
Plarlimetric features outside spe
Willi)
Coi-ital base flood elevations a
541�1�
hown on this map,
NE B
1:18191,5R, s
t
RM 7 For adjoining map panels,see
Panos.
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To determine if flood insurant
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T ZONE C
>> JOINS PANEL.0900
Olympic National Fores. I
34 35 36 500-Year Flood Boundary
35 36 31 32 ZONE C 33 T.22 N. 100-Year Flood Boundary
T.22 N. NATIONAL FOREST BOUNDARY Zone Designations
T.21 N. &
T.21 N.
}� � �
a; x.'
� � A 100-Year Flood Boundary
ZI ZONE C 500-Year Flood Boundary-
Base
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Base Flood Elevation Line ---^-513-
m® 1 6 5 cet� °hCe 4 3 2 1 Base Flood Elevation in Feet** (EL 9Bi
OC Z
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2I Q 6 5 4 r`S11fle Elevation Reference Mark RM7}
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Q
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Q River Mile
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ZONE A **Referenced to the National Geodetic Vertical Datum�
I EXPLANATION OF ZONE DESIGNAI
,
I
ZONE EXPLANATION
aA Areas of 100-year flood;base flood elev,
ZONE C o'er
6 flood hazard factors not determined.
AO Areas of 100-year shallow flooding wh(
10 are between one(1)and three(3)feet;aver
of inundation are shown,but no flood haz
E X n"I 10 11 g `� `1, are determined.
oding wh(
8 9 7711 are between one(1)and three(3)feet;
7 ow
AH elevations arAreas of e shown,labut nollow loflood haz.
N 0® are determineRESOU d.
Al-A30 Areas of 100-year flood;base flood elev
flood hazard factors determined.
I' elevtations andstflood hazard fact ors tlnot c
A99 Areas of 100 year flood to be protecte�
pro
ec ion
I 0
wr
B Areas between limits of the 100 year flop
yea
in areas
BOUNDARY L e w thercontrdibutingrdrainage area iscle soth0n
NATIONAL FOREST „ ew ing with average depths less than one(1)fo
a Z mile;or areas protected by levees from the
a (Medium shading)
ka,�d z C Areas of minimal flooding.(No shading)
m ' it o D Areas of undetermined,but possible,flo
V Areas of 100-year coastal flood with vel
action);base flood elevations and flood ha
t' 16 15 14 13 not determined.
r 04 9.7 V1-V30 Areas of 100-year coastal 91000 wrm ver
18 17 Soti� 16 15 14 13 18
action);base flood elevations and flood ha
determined.
Fork NOTES TO USER �
ZONE C
v 3
r -- a be protected by flood control structures.
Certain areas not in the special flood hazard areas zon
)'
x
g This map is for use in administer
in the National Floc '
Program;it does not necessarily identify all areas sub'1
ing,particularly from local drainage sources of sma
planimetric features outside special flood hazard areas.
ii
1
Coastal base flood elevations apply only landward of 1'
shown on this map.
b� For adjoining map panels,see separately printed In(
Panels.
23 24
22
19 20 21 INITIAL IDENTIFICATION:
22 23 24
I9 20 21 AucusT 9,1977
FLOOD HAZARD BOUNDARY MAP REVIS
RAILRoA® MAY 15,1979
I� ZONE A ��'
4®GGtNG
la FLOOD INSURANCE RATE MAP EFFECT
MAY 17,1988
�R
,ZONE A \
NE c gE��t`�`E l
25
ZONE 28 27 26
27 26
25 30 29
30 29 q '7r r
ZONE A
ZONE C
as
LOOP
G`9e°& Refer to the FLOOD INSURANCE RATE MAP EF
shown on this map to determine when actuarial
�G structures in the zones where elevations or depths h
p<
ZONE C 12 fished.
G'J To determine if flood insurance is available in th
ZONE 35 O� 35 36 contact your insurance agent,or call the National 1
34 32 33 34 Program,at(800)638 6620.
36 31
31 32 33
� T.21 N.
T.20 N. APPROXIMATE SCALE IN FEET
2000 0
IIANKS
® T.21 N. ®® ZONE A t°1° LAKE
T.20 N. ti
-- -_—_ NATIONAL FLOOD INSURE
I ZONE A
� 2 1
4 3
1 5 5
ZONE C 4 3 2 RAILIIOA® F IRIA
6 5 o ZONE � o
z I LOGGING �® INSURANCE
2 a
4 ,z ZONE A o
z
j A MASON COUN
AS I T I-
(UNINCORPORATL
a 11 X
�v 10 r 12
MATLOCK 9
I .
PANEL 17 OF 30
�3S 8 9 10 11 12 7 8 ZONE A (SEE MAP INDEX FOR PANE
ZONE A
CC CC
ZONE A - --
ZONE A
_ o
HILLAIAN
FISH POND
ZONE A
ZONE A i
o `e� h'ORROIfa 14 O'eekro�',' 13
® Z � ZONE C LAKEcc
O O Wig- ZONE d� 15 r � '
m 0 13 18 _ ZONE }'
Z r 17 16 {I
s
l�
T !� 17 -
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