Flood Control - CLOMR - Silvercreek Development (Mace 1 LLC) - 5/1/2024Federal Emergency Management Agency
Washington, D.C. 20472
CERTIFIED MAIL
RETURN RECEIPT REQUES 1'ED
The Honorable Brad Pike
Mayor, City of Eagle
660 East Civic Lane
P.O. Box 1520
Eagle, ID 83616
May 1, 2024
IN REPLY REFER TO:
Case No.: 23-10-0449R
Community Name: City of Eagle, ID
Community No.: 160003
Dear Mayor Pike:
We are providing our comments with the enclosed Conditional Letter of Map Revision (CLOMR) on a proposed
project within your community that, if constructed as proposed, could revise the effective Flood Insurance Study
report and Flood Insurance Rate Map for your community.
If you have any questions regarding the floodplain management regulations for your community, the National Flood
Insurance Program (NFIP) in general, or technical questions regarding this CLOMR, please contact the Director,
Mitigation Division of the Federal Emergency Management Agency (FEMA) Regional Office in Bothell, WA at
(425) 487-4543, or the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA
MAP). Additional information about the NFIP is available on our website at
httos://www.fema.aov/flood-insurance.
Sincerely,
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration
List of Enclosures:
Conditional Letter of Map Revision Comment Document
cc:
Rod Beck
Chair, Ada County Board of Commissioners
Mike Williams
Floodplain Administrator
City of Eagle
Zach Kirk
County Engineer
Ada County Development Services
Peter Jackson
State NFIP Coordinator
Idaho Department of Water Resources
Ron Manning, MS, P.E., CFM
Principal Engineer
Manning Civil
Page 1 of 8 I Issue Date: May 1, 2024
I Case No.: 23-10-0449R
CLOMR-APP
COMMUNITY
Federal Emergency Management Agency
Washington, D.C. 20472
CONDITIONAL LETTER OF MAP REVISION
COMMENT DOCUMENT
COMMUNITY INFORMATION
City of Eagle
Ada County
Idaho
COMMUNITY NO.: 160003
IDENTIFIER Silvercreek Development CLOMR
AFFECTED MAP PANELS
TYPE: FIRM* NO.: 16001C0134J
TYPE: FIRM NO.: 16001C0135J
TYPE: FIRM NO.: 16001C0142J
TYPE: FIRM NO.: 16001C0153J
TYPE: FIRM NO.: 16001C0161J
DATE: June 19, 2020
DATE: June 19, 2020
DATE: June 19, 2020
DATE: June 19, 2020
DATE: June 19, 2020
FLOODING SOURCE(S) AND REACH DESCRIPTION
PROPOSED PROJECT DESCRIPTION
FILL
EXCAVATION
BASIS OF CONDITIONAL REQUEST
1 D HYDRAULIC ANALYSIS
FLOODWAY
UPDATED TOPOGRAPHIC DATA
APPROXIMATE LATITUDE & LONGITUDE: 43.679, -116.376
SOURCE: OTHER DATUM: NAD 83
* FIRM - Flood Insurance Rate Map
See Page 2 for Additional Flooding Sources
South Channel Boise River Eagle Island — From the confluence with Boise River to approximately 1,500 feet downstream of S Eagle Road
Flooding Source
South Channel Boise River Eagle Island
Flooding Source
South Channel Boise River Eagle Island
Proposed Project
Fill Placement
PROPOSED PROJECT DESCRIPTION
Location of Proposed Project
Approximately 7,000 feet downstream of S Eagle Road
SUMMARY OF IMPACTS TO FLOOD HAZARD DATA
Effective Flooding
BFEs*
Floodway
Zone AE
* BFEs - Base (1-percent-annual-chance) Flood Elevations
Proposed Flooding
BFEs
Floodway
Zone AE
COMMENT
Increases
Yes
Yes
Yes
Decreases
Yes
Yes
Yes
This document provides the Federal Emergency Management Agency's (FEMA's) comment regarding a request for a CLOMR for the project described above.
This document is not a final determination; it only provides our comment on the proposed project in relation to the flood hazard information shown on the effective
National Flood Insurance Program (NFIP) map. We reviewed the submitted data and the data used to prepare the effective flood hazard information for your
community and determined that the proposed project meets the minimum floodplain management criteria of the NFIP. Your community is responsible for
approving all floodplain development and for ensuring that all permits required by Federal or State/Commonwealth law have been received. State/Commonwealth,
county, and community officials, based on their knowledge of local conditions and in the interest of safety, may set higher standards for construction in the Special
Flood Hazard Area (SFHA), the area subject to inundation by the base flood). If the State/Commonwealth, county, or community has adopted more restrictive or
comprehensive floodplain management criteria, these criteria take precedence over the minimum NFIP criteria.
This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange
(FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426.
Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance.
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration 23-10-0449R 104
Page 2 of 8 I Issue Date: May 1, 2024
O�eA�\FA.
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41 ND SV,C
ICase No.: 23-10-0449R I CLOMR-APP
Federal Emergency Management Agency
Washington, D.C. 20472
CONDITIONAL LETTER OF MAP REVISION
COMMENT DOCUMENT (CONTINUED)
COMMUNITY INFORMATION (CONTINUED)
ADDITIONAL FLOODING SOURCES AFFECTED BY THIS CONDITIONAL REQUEST
FLOODING SOURCE(S) AND REACH DESCRIPTION
Boise River — From the confluence with South Channel Boise River Eagle Island to just downstream of S Eagle Road
South Channel Boise River Right Overbank — From the confluence with South Channel Boise River Eagle Island to just upstream of S Linder Road
PROPOSED PROJECT DESCRIPTION
Flooding Source Effective Flooding Proposed Flooding Increases Decreases
Boise River BFEs BFEs Yes Yes
Floodway Floodway Yes Yes
Zone AE Zone AE Yes Yes
South Channel Boise River Right Overbank BFEs BFEs None Yes
Floodway Floodway Yes Yes
Zone AE Zone AE Yes Yes
This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange
(FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426.
Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance.
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration 23-10-0449R 104
Page 3 of 8 I Issue Date: May 1, 2024
ICase No.: 23-10-0449R I CLOMR-APP
Federal Emergency Management Agency
Washington, D.C. 20472
CONDITIONAL LETTER OF MAP REVISION
COMMENT DOCUMENT (CONTINUED)
OTHER COMMUNITIES AFFECTED BY THIS CONDITIONAL REQUEST
CID Number: 160001 Name: Unincorporated Areas of Ada County, Idaho
TYPE: FIRM NO.. 16001C0134J
TYPE: FIRM NO.: 16001C0135J
TYPE: FIRM NO.: 16001C0141J
TYPE: FIRM NO.: 16001C0142J
TYPE: FIRM NO.: 16001C0153J
DATE: June 19, 2020
DATE: June 19, 2020
DATE: June 19, 2020
DATE: June 19, 2020
DATE: June 19, 2020
AFFECTED MAP PANELS
This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange
(FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426.
Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance.
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration 23-10-0449R 104
Page 4 of 8 I Issue Date: May 1, 2024
ICase No.: 23-10-0449R I CLOMR-APP
ICtitta4-
4-4lt Sti�1
Federal Emergency Management Agency
Washington, D.C.
CONDITIONAL LETTER OF MAP REVISION
COMMENT DOCUMENT (CONTINUED)
COMMUNITY INFORMATION
To determine the changes in flood hazards that will be caused by the proposed project, we compared the hydraulic modeling reflecting the proposed
project (referred to as the proposed conditions model) to the hydraulic modeling used to prepare the Flood Insurance Study (FIS) (referred to as the
effective model). If the effective model does not provide enough detail to evaluate the effects of the proposed project, an existing conditions model must
be developed to provide this detail. This existing conditions model is then compared to the effective model and the proposed conditions model to
differentiate the increases or decreases in flood hazards caused by more detailed modeling from the increases or decreases in flood hazards that will be
caused by the proposed project.
The table below shows the changes in the BFEs:
Flooding Source:
South Channel Boise River Eagle Island
Existing vs.
Effective
Proposed vs.
Existing
Proposed vs.
Effective
Maximum increase
Maximum decrease
Maximum increase
Maximum decrease
Maximum increase
Maximum decrease
Flooding Source:
Boise River
Existing vs.
Effective
Proposed vs.
Existing
Proposed vs.
Effective
Maximum increase
Maximum decrease
Maximum increase
Maximum decrease
Maximum increase
Maximum decrease
Flooding Source:
South Channel Boise River Right Overbank
Existing vs.
Effective
Proposed vs.
Existing
Proposed vs.
Effective
Maximum increase
Maximum decrease
Maximum increase
Maximum decrease
Maximum increase
Maximum decrease
BFE Comparison Table
BFE Change (feet) Location of maximum change
0.7
1.0
0.0
0.0
0.7
1.0
BFE Change (feet)
1.4
0.9
0.0
0.0
1.4
0.9
BFE Change (feet)
0.0
0.9
0.0
0.0
0.0
0.9
Approximately 2,400 feet downstream of S Eagle Road
Approximately 8,900 feet downstream of S Eagle Road
N/A
N/A
Approximately 2,400 feet downstream of S Eagle Road
Approximately 8,900 feet downstream of S Eagle Road
Location of maximum change
Approximately 1,120 feet upstream of S Linder Road
Approximately 560 feet downstream of S Eagle Road
N/A
N/A
Approximately 1,120 feet upstream of S Linder Road
Approximately 560 feet downstream of S Eagle Road
Location of maximum change
N/A
Just upstream of S Linder Road
N/A
N/A
N/A
Just upstream of S Linder Road
This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange
(FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426.
Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance.
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration
23-10-0449R
104
Page 5 of 8 I Issue Date: May 1, 2024
ICase No.: 23-10-0449R I CLOMR-APP
Federal Emergency Management Agency
Washington, D.C. 20472
CONDITIONAL LETTER OF MAP REVISION
COMMENT DOCUMENT (CONTINUED)
COMMUNITY INFORMATION (CONTINUED)
NFIP regulations Subparagraph 60.3(b)(7) requires communities to ensure that the flood -carrying capacity within the altered or relocated portion of any
watercourse is maintained. This provision is incorporated into your community's existing floodplain management ordinances; therefore, responsibility foi
maintenance of the altered or relocated watercourse, including any related appurtenances such as bridges, culverts, and other drainage structures, rests
with your community. We may request that your community submit a description and schedule of maintenance activities necessary to ensure this
requirement.
This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange
(FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426.
Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance.
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration 23-10-0449R 104
Page 6 of 8 I Issue Date: May 1, 2024
ICase No.: 23-10-0449R I CLOMR-APP
Federal Emergency Management Agency
Washington, D.C. 20472
CONDITIONAL LETTER OF MAP REVISION
COMMENT DOCUMENT (CONTINUED)
COMMUNITY INFORMATION (CONTINUED)
DATA REQUIRED FOR FOLLOW-UP LOMR
Upon completion of the project, your community must submit the data listed below and request that we make a final determination on
revising the effective FIRM and FIS report. If the project is built as proposed and the data below are received, a revision to the FIRM and
FIS report would be warranted.
• Form 1, entitled "Overview & Concurrence Form". Detailed application and certification forms must be used for requesting final
revisions to the maps. Therefore, when the map revision request for the area covered by this letter is submitted, Form 1 must be included.
If as -built conditions differ from the proposed plans, please submit new forms, which may be accessed at https://www.fema.gov/flood-
maps/change-your-flood-zone/paper-application-forms/mt-2, or annotated copies of the previously submitted forms showing the revised
information.
• Form 2, entitled "Riverine Hydrology & Hydraulics Form."
• Hydraulic analyses, for as -built conditions, of the base flood; the 10-percent, 2-percent, and 0.2-percent-annual-chance floods; and the
regulatory floodway, together with a topographic work map showing the revised floodplain and floodway boundaries. Please ensure that
the revised information ties in with the current effective information at the downstream and upstream ends of the revised reach.
• Annotated copies of the FIRMs, at the scale of the effective FIRMs, that shows the revised floodplain and floodway boundary
delineations shown on the submitted work map and how they tie into the floodplain and floodway boundary delineations shown on the
current effective FIRMs at the downstream and upstream ends of the revised reach.
• As -built plans, certified by a registered professional engineer, of all proposed project elements.
• A copy of the public notice distributed by your community, stating its intent to revise the regulatory floodway, or a signed statement by
your community that it has notified all affected property owners and affected adjacent jurisdictions.
• Documentation of the individual legal notices sent to property owners who will be affected by any widening/shifting of the base
floodplain and/or any BFE increases along South Channel Boise River Eagle Island, Boise River, and South Channel Boise River Right
Overbank.
This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange
(FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426.
Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance.
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration
23-10-0449R
104
Page 7 of 8 I Issue Date: May 1, 2024
ICase No.: 23-10-0449R I CLOMR-APP
Federal Emergency Management Agency
Washington, D.C. 20472
CONDITIONAL LETTER OF MAP REVISION
COMMENT DOCUMENT (CONTINUED)
COMMUNITY INFORMATION (CONTINUED)
• A letter stating that your cotntnunity will adopt and enforce the modified regulatory floodway, OR, if the State/Commonwealth has
jurisdiction over either the regulatory floodway or its adoption by your community, a copy of your community's letter to the appropriate
State/Commonwealth agency notifying it of the modification to the regulatory floodway and a copy of the letter from that agency stating its
approval of the modification.
• FEMA's fee schedule for reviewing and processing requests for conditional and final modifications to published flood information and
maps may be accessed at https://www.fema.gov/flood-maps/change-your-flood-zone/status/flood-map-related-fees. The fee at the time of
the map revision submittal must be received before we can begin processing the request. Payment of this fee can be made through a check
or money order, made payable in U.S. funds to the National Flood Insurance Program, or by credit card (Visa or MasterCard only). Please
forward the payment, along with the revision application, to the following address:
LOMC Clearinghouse
3601 Eisenhower Avenue, Suite 500
Alexandria, VA 22304-6426
After receiving appropriate documentation to show that the project has been completed, FEMA will initiate a revision to the FIRM and FIS
report. Because the flood hazard information (i.e., base flood elevations, base flood depths, SFHAs, zone designations, and/or regulatory
floodways) will change as a result of the project, a 90-day appeal period will be initiated for the revision, during which community officials
and interested persons may appeal the revised flood hazard information based on scientific or technical data.
This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange
(FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426.
Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance.
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration 23-10-0449R 104
Page 8 of 8 I Issue Date: May 1, 2024 I Case No.: 23-10-0449R I CLOMR-APP
Federal Emergency Management Agency
Washington, D.C. 20472
CONDITIONAL LETTER OF MAP REVISION
COMMENT DOCUMENT (CONTINUED)
COMMUNITY INFORMATION (CONTINUED)
COMMUNITY REMINDERS
We have designated a Consultation Coordination Officer (CCO) to assist your community. The CCO will be the primary liaison between
your community and FEMA. For information regarding your CCO, please contact:
Kristen Meyers
Director, Mitigation Division
Federal Emergency Management Agency, Region X
Federal Regional Center
130 228th Street, Southwest
Bothell, WA 98021-8627
(425) 487-4543
This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange
(FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426.
Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance.
Patrick "Rick' F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration 23-10-0449R 104