Federal Emergency Management Agency

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Federal Emergency Management Agency

Washington, D.C. 20472

CERTIFIED MAIL

RETURN RECEIPT REQUESTED The Honorable Dario Herrera

Chairman, Clark County Board of Commissioners 500 Grand Central Parkway

Las Vegas, NV 89155-1601

IN REPLY REFER TO: Case No.: 01-09-581P

Community: Clark County, NV

Community No.: 320003

Panels Affected: 32003C2545 D, 2550 D, 2552 D, 2553 D, 2554 D, 2561 D, and 2562 D Effective Date of

This Revision:

SEP 0

4

2001

102-I-c Dear

Mr.

Herrera:

This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) for Clark County, Nevada and Incorporated Areas, in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated March 30,

2001

, Mr.

Kevin L. Eubanks, P.E., Assistant General Manager, Clark County Regional Flood Control

District, requested that FEMA revise the FIRM to show the effects of construction of the Blue Diamond

Detention Basin (BDDB) along the Blue Diamond alluvial fan from just downstream of the BDDB on

the west to the Union Pacific Railroad (UPRR) on the east. This request follows up on a Conditional

Letter of Map Revision issued on January 3 1,2000, and a Letter of Map Revision (LOMR) issued on

June 28,2000 (Case No. 00-09-428P).

All data required to complete our review of this request were submitted with letters from Mr. Eubanks.

Because this LOMR shows the effects of a federally sponsored flood-control project where 50 percent or

more of the project's costs are federally funded, fees were not assessed for the review.

We have completed our review of the submitted data and the flood data shown on the effective FIRM.

We have revised the FIRM to modify the floodplain boundary delineations and zone designations of the flood having a 1-percent chance of being equaled or exceeded in any given year (base flood) along the

Blue Diamond Fan from just upstream of the BDDB on the west to the UPRR on the east. The zone

designation was changed from Zone A99, an area that would be inundated by the base flood but that is protected by a Federal flood-protection system under construction, with no Base Flood Elevations

determined, to Zone X (shaded), an area that would be inundated by the base flood with average depths

less than 1 foot, for the area downstream of the BDDB. The width of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, increased as a result of the pool elevation of the base flood behind the detention basin. The modifications are shown on the enclosed annotated copies

of FIRM Panels 32003C2545 D, 32003C2550 D, 32003C2552 D, 32003C2553 D, 32003C2554 D,

32003C2561 D, and 32003C2562 D. This LOMR hereby revises the above-referenced panels of the

effective FIRM dated August 16, 1995.

The modifications are effective as of the date shown above. The map panels as listed above and as modified by this letter will be used for all flood insurance policies and renewals issued for your community.

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A review of the determination made by this LOMR and any requests to alter this determination should be made within 30 days. Any request to alter the determination must be based on scientific or technical data.

We are preparing a revised FIRM and Flood Insurance Study (FIS) report for Clark County; therefore,

we will not physically revise and republish the FIRM and FIS report for your community to incorporate the modifications made by this LOMR at this time. Preliminary copies of the revised FIRM and FIS

report will be distributed for review in approximately 4 months. We will incorporate the modifications

made by this LOh4R into the Preliminary copies of the revised FIRM before it is distributed, and the

modifications will be included when the revised FIRM becomes effective.

This LOMR is based on minimum floodplain management criteria established under the NFIP. Your

community is responsible for approving all floodplain development and for ensuring all necessary permits required by Federal or State law have been received. State, county, and community officials, based on knowledge of local conditions and in the interest of safety, may set higher standards for

construction in the SFHA. If the State, county, or community has adopted more restrictive or

comprehensive floodplain management criteria, these criteria take precedence over the minimum NFIP

criteria.

Because this LOMR will not be printed and distributed to primary users, such as local insurance agents

and mortgage lenders, your community will serve as a repository for these new data. We encourage you

to disseminate the information reflected by this LOMR throughout the community, so that interested

persons, such as property owners, local insurance agents, and mortgage lenders, may benefit from the information. We also encourage you to prepare an article for publication in your community's local

newspaper. This article should describe the changes that have been made and the assistance that officials

of your community will give to interested persons by providing these data and interpreting the NFIP maps.

This determination has been made pursuant to Section 206 of the Flood Disaster Protection Act of 1973

(Public Law 93-234) and is in accordance with the National Flood Insurance Act of 1968, as amended

(Title XI11 of the Housing and Urban Development Act of 1968, Public Law 90-448), 42 U.S.C.

400 1-4 128, and 44 CFR Part 65. Pursuant to Section 136 1 of the National Flood Insurance Act of 1968,

as amended, communities participating in the NFIP are required to adopt and enforce floodplain

management regulations that meet or exceed NFIP criteria. These criteria are the minimum requirements and do not supersede any State or local requirements of a more stringent nature. This includes adoption of the effective FIRM to which the regulations apply and the modifications described in this LOMR.

Our records show that your community has met this requirement.

A Consultation Coordination Officer (CCO) has been designated to assist your community. The CCO

will be the primary liaison between your community and FEMA. For information regarding your CCO,

please contact:

Mr. Jack Eldridge

Chief, Community Mitigation Programs Branch

Federal Emergency Management Agency, Region IX

The Presidio of San Francisco, Building 105

San Francisco, CA 94129-1250

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If you have any questions regarding floodplain management regulations for your community or the NFIP

in general, please call the CCO for your community at the telephone number cited above. If you have

any questions regarding this LOMR, please call our Map Assistance Center, toll free, at

1-877-FEMA MAP (1-877-336-2627).

Sincerely,

/$% L t

vw---

Max H. Yuan, P.E., Project Engineer Hazards Study Branch

Federal Insurance and Mitigation Administration Enclosures

cc: Mr. Gale Wm. Fraser 11, P.E.

General ManagerKhief Engineer Clark County Regional Flood

Control District

Mr. Kevin L. Eubanks, P.E. Assistant General Manager Clark County Regional Flood

Control District Mr. Martin Manning Director

Clark County Department of Public Works

Mr. Steve Parrish

Clark County Department of Public Works

Mr. Robert E. Koplin, P.E. Chief, Engineering Division

U.S. Army Corps of Engineers, Los Angeles District

For: Matthew B. Miller, P.E., Chief

Hazards Study Branch Federal Insurance and

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APPROXIMATE SCALE IN FEET 2000 - 0 2000 =l&iepp___!

'REVISED TO

~

1

23

12

'

(

REVISED AREA

NOTE: THIS AREA SUBJECT

24

TO

I

A L L U V I A L FAN FLOODING.

19

25

I i I I I I

3c

I /

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BY 100-YEAR F L O O D

SPECIAL F L O O D H A Z A R D AREAS INUNDATED

ZONE A No base flood elevanons detfrm ned

Z O N E AE Base flood elevabons determ ned

ZONE AH Flood depths of 1 to 3 feet (usually areas of pondlng) base flood elevanons determ ned

ZONE A 0 Flood depths of 1 to 3 feet (usually sheet flow on sloping terrain) average depths determined For areas of alluv al fan flood n& velwtms also determ ned

ZONE A99 To be pmteded from 100-year flood by Federal flood protect on system under

construmon no base flood elevatons determ ned

Z O N E V Coastal flood wlth velocty hazard wave amon) no base flood elevat ons determ ned

ZONE VE Coastal flood wlth velouty hazard (wave amon) base flood elevauons determ ned

P

I

FLOODWAY AREAS IN ZONE AE

I

OTHER FLOOD AREAS

Z O N E X Areas of 50Gyear flood areas of 100-year 1 foot or w t h dra nage areas less than

flood w t h average depths of less than

1 square mile and areas proteaed by levees from 1 W e a r flood

115' 13 0 7 115" 11 15 36" 0 5 37 36" 05 37

7--=

29

R E F E R E N C E E L E V A T I O N E L E V A T I O N R E F E R E N C E M A R K S M A R K ( F E E T N G V D ) D E S C R I P T I O N OF L O C A T I O N R M 2 2 3 2 2 1 7 1 4 BLM b r a r r c a p r t a m p r d " 1 2 1 s R 6 1 E E 1 / 1 6 C C S 3 0 1 9 5 7 " R M 2 2 4 2 2 4 9 81 T o p n u t n o r t h e a r t c o r n r r , u p p r r f l a n g e o f h y d r a n t , s o u t h r i d 0 H a c i r n d a A v r n u o , a n d 2 5 0 f o o t wort o f C a m e r o n S t r o e 1 R M 2 2 5 2 2 9 3 6 0 5 / 8 I n c h r o b a r a n d a l u m ~ n u m c a p m a r k r d " P L S 5 5 7 1 E R M , " 5 1 . 0 1 o a r 1 a n d 5 f r e t r o u t h o f s t o o l p o w r r W o r t R u r r e l 1 R o a d a n d E d m u n d I I n r t o w e r ( n e a r l n t e r r r c t ~ o n o f St r o o t ) R M 2 2 6 2 3 2 0 7 7 1 1 / 2 I n c h d i a m r l o r b r o s r c a p s t a m p e d " U S C E D l S T T D 9 2 1 1 " 5 0 p a v e m e n t o n O q u e n d o R o a d f o r t w o r t o f L l n d r l l R o a d i n ZONE X

25

ZONE X ZONE A

0

OTHER Z O N E X AREAS Areas determlned to be outsde 50Gyear floodplain

ZONE D Areas In which flood hazards are undetermrned

ZONE X

UNDEVELOPED COASTAL BARRIERS

ldent f e d Identifed 1983 1990

Otherw se Protected Areas Coastal barr er areas are norma ly located w th n or ad acent to Spec a

Flood Hazard Areas

Floodpla n Boundary

---

Floodway Boundary ---- Zone D Boundar) RM225 ZONE X '4 1

Boundary D v d n g Speca Food Hazard Zones and Boundaw D v d ng Areas of Dfferent Coasta Base Food E evat ons W th n Spcc al Food Hazard Zones

Base Flood Elevaton L ne E evatlon n Feet See Map ndex for Elevat on Datum

Cross Secton L n e

Base Food Elevat on n Feet Where Unform Wth n Zone See Map Index for Eevaton Datum Elevat on Reference Mark

4 V E

1

ZONE X

(EL 987)

RM7X

M2 R ver M le

9 7 " 07 30 32" 2 2 30 Amer can Datum of 1927 (NAD 27

Horzonta Coordnates Based on North

Project on

NOTES

Th s map s for use n adm n slerlng the Nat one Food nsurance Program local dra nage sources of sn a I s ze or all plan metr c features outs de

t does not necessar y dent fy II I areas subject to flood ng part cularly from Speca Flood Hazard Areas The communty map repostory shou d be f oodway de neat ons pr or to use of th s map for property purchase or

consulted for more deta led data on BFE 8 anc for any nformat on on

construct on purposes

Areas of Specal Flood Haza d (100-year food) nclude Zones A AE A1

A30 AH A 0 A99 V VE and M V30

Certa n areas not n Speca Flood Hazard Areas rnay be protected oy

f o o d contro structures

Boundares of the floodways were computed at cross sect ons and nterpo ated between cross sect ons The floodways were based on hydraul c cons deratons w th regard to requ emenls of the Fede al Emergency Management Agency

Floodway w dths n some areas may be too narrow to show t o sca e Refer to F oodway Data Table where floodway w dth s shown a t EO nch the effects of wave act on these e evatlons may also d ffer s gn f cant y

Coastal base flood Clevat ons apply only landward of 0 0 NGVD and nc ude

from those d e w oped by the Natlonal Weather Servce for hurr cane evacuat on p ann ng

Corporate I m ts shown are current as of the date of t h s map The user

should contact approprate communty offlcals to determ ne f corporate I m t s have changed subsequent to the ssuance of t h s map

Th s map rnay ncorporate approxlmate boundares of Coastal Ba r er under the Coastal Barr er Improvement Act of 1990 (PL 101-591) Resource System Unts and /or O t h e r w w Protected Areas estab shed

For communry map revs on hstory pror to countywde mapp ng see Sectlon 6 0 of tho Flood Insurance Study Report

For adlo n ng map panes and base map source see separately pr n ed Map ndex

MAP REPOSITORY

Refer to Reposltory Listmg on Map Index

EFFECTIVE DATE OF

C O U N W I D E FLOOD INSURANCE RATE MAP

AUGUST 16 1996

EFFECTIVE JATE(S) OF REVISION(S) TO THIS PANEL

ROAD

I

32

~ ZONE X

CLARK COUNTY

UNINCORPORATED

AREAS

320003

r w AREA SUBJECT TO

l U V W FAN PLOODING.

i

Refer on th to s map to determ ne when actuar the FLOOD NSURANCE RATE MAP EFFECTIVE DATE al rates apply to structures n shown zones where e evat ons or depths have been establ shed

To dererm ne f f ood nsurance s ava able contact an nsurance agent or ca I the Net one Food Insurance Program at (800) 6384620

APPROXIMATE SCALE IN FEET 500

H W H

0 500

I

1

NATIONAL

FLOOD

INSURANCE PROGRAM

FLOOD

INSURANCE RATE MAP

CLARK COUNTY,

NEVADA AND

INCORPORATED AREAS

PANEL

2554

OF

4090

(SEE MAP INDEX FOR PANELS NOT PRINTED)

NUMBER P A N E L W F X

CLARK COUNTY

UN NCOAPCPATED AREAS 320003 2654 D

r

MARTIN

ZONE X

THIS AREA SUBJECT TO ALLUVIAL F A N FLOODING. ZONE X

1

6

MAULE

MAP NUMBER

32003C2554

D

EFFECTIVE DATE:

AUGUST

16,1995

I

I 36" 03 45 115" 11 15 36" 03 45 JO NS PANEL 2582 115' 13 07

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115" 15 0 0

36" 0 3 45

2

ZONE X

ZONE A No base flood elwabonr dete ZONE AE Base flood eleyat!ons determm ZONE AH Flood d e p h of 1 to 3 feet

of pondngl base floo

determlned

ZONE A 0 Flood depth6 of 1 to 3 f e e t

flow on sloping terrain) a) velocltles a b determined determined For areas of aIiuvlI

ZONE A99 To be protected from 10G) Federal flood prutect~on 6

mnstruaon no base fla

determ ned

ZONE V Coastal flood w th velocity

adon) no base flood elevat!ot ZONE VE Coastal flocd w ~ t h velocty

a d o n ) base R o o d elevation

FLOODWAY AREAS IN ZONE AE

ZONE X area^ of 5 W y e a r flood area

1 foot or w th drainage arm

flood with average depths 1 square mlle and area

I- from ICC-year R o o d

Areas determ n e d m be out!

floodplain

ZONE D Areas In whlch flood undeterm ned

UNDEVELOPED COASTAL BARRIERS

ldentltled

1990 P

Coastal barr er areas are normalty ocated w t h n or adjacen' Flood Hazard Areas

Floodpla n Boundary Floodway Boundary Zone D Boundary Boundary D v d ng Sps Hazard Zones and Dtvd ng Areas of Coasta Base Flood W t h n Spec el Flooc Zones

Base F o o d E e v a t (

Eevauon n Feet S e e

for Elevat on Datum Cross Sect on Line

Base F o o d E evatlon Whers Unform Wrth

See Map Index for E evs E w a t on Reference Murk

Rver M e

9 7 ' 0 7 50 32' 22 30 Amencan Datum of 192

Honzontal Coord nates Bas Pro ect on

---

----

-

513-

NOTES

T h s map s for use n adm n sterna the Nat ona Flood Insursm

rt doe8 not necessarily dent!fV all areas subject to f o o d ng part

Specal Food Hazard Arws The community map repostor)

oca1 dra nage sourcea of small s ze or a I plan m e t r c f e a t consulted for more detu led data on BFE s and for any nfc

flowtway de neat on3 pr or to use of th s map for property constructlon purposes

Areas of Spec a1 Flood Hazard (lCC-year f o o d ) nclude Zones /

A30 AH A 0 A99 V VE and v'l V30

Cena n areas not n Specal Food Hazard Areas may be pr flood control structures

Boundar es of the floodways were computed at cross se

hydraul c cons derat ons w t h regard to requ remenu of tl

nterpolated between cross sectons The floodways were Emergency Management Agency

Floodway w dths n some areas may be too narrow to show to to Floodway Data Table where floodway w dth s shown a t WC

the effects of wave amon these e l w a t o n s may a s 0 dffer Coastal base f o o d e l w a t ons app y only a n h a r d of 0 0 NGVD from those developed by the Natonal Weather Sewca fc evecuat on plann ng

3 h O U d contact approprate commun ty off cals to determ ne 1

Corporate I m b shown are current as of the date of th 3 map m t s have changed subsequent to the Issuance of L * E S T ROBINDALE

ROAD

ZONE X

THIS AREA SUBJECT TO

ALLUVIAL F A N FLOODING

I

I WEST W l h D U l L L LANE , ZONE X I

WEST WIGWAM AVENUE

I

I 36' 01 5 2 115' 1

/

CLARK

COUNTY

UNINCORPORATED

AREAS

320003

11

THIS AREA SUBJECT TO

ALLUVW FAN FLOODING.

THIS AREA SUBJECT TO W W W F A N FLOODING.

\

14

NOTE: MAP AREA SHOWN O N THIS PANEL IS LOCATED WITHIN TOWNSHIP 22 SOUTH, RANGE 60 EAST.

ZONE X

I

JOINS PANEL 2666

/

12

0 7 36' 0 3 4 5

1

For communty map revson h story pror to counrfwde ma

S e c t on 6 0 of the Flood Insurance Study Report

For a d o n nQ map panels and base map source see separa'

MAP REPOSITORY

Refer to Fieposltory Lstmg on Map ndex

EFFECTIVE DATE OF

C O U N W N D E FLOOD INSURANCE RATE M A

AUGUST 16 1996

EFFECTIVE DATEIS) OF REVISIONIS) TO THIS PAN

Refer to the FLOOD IhSURANCE RATE MAP EFFECTIVE DA on thls map to determ ne when actuara ratas a p p y to st)

zones M e r e e wat ons or depths have been estab shed To determ ne f + ood nsurance s a k a lab e contact an r s ~ r a r c

caI the Nat onal F o o d nsurance Program at BOO 6 3 W 2 0

APPROXIMATE SCALE IN FEET

1

36'01 5 2

07

I

Th s map may ncorporate approxlmate bounder as of Coa under the Coastal Barrer rnprovement Act of 1990 (PL 1(

Resource System Un ts and /or M h e r w s e Protected Areas

FLOOD INSURANCE

RA1

CLARK COUNTY,

NEVADA AND

INCORPORATED

L

PANEL 2561

OF

4090

(SEE MAP INDEX FOR P A N E L S N O

C M K UNINCORPORATEO COUNTY AREAS 320003 2

MAP

3200:

EFFECTI'

AUGUSl

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