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NOTES TO USERS This map is for use in administering the National Flood Insurance Program. It does not necessarily identify all areas subject to flooding, particularly from local drainage sources of small size. The community map repository should be consulted for possible updated or additional flood hazard information. To obtain more detailed information in areas where Base Flood Elevations (BFEs) and/or floodways have been determined, users are encouraged to consult the Flood Profiles and Floodway Data and/or Summary of Stillwater Elevations tables contained within the Flood Insurance Study (FIS) report that accompanies this FIRM. Users should be aware that BFEs shown on the FIRM represent rounded whole- foot elevations. These BFEs are intended for flood insurance rating purposes only and should not be used as the sole source of flood elevation information. Accordingly, flood elevation data presented in the FIS report should be utilized in conjunction with the FIRM for purposes of construction and/or floodplain management. Coastal Base Flood Elevations shown on this map apply only landward of 0.0' North American Vertical Datum of 1988 (NAVD 88). Users of this FIRM should be aware that coastal flood elevations are also provided in the Summary of Stillwater Elevations table in the Flood Insurance Study report for this jurisdiction. Elevations shown in the Summary of Stillwater Elevations table should be used for construction and/or floodplain management purposes when they are higher than the elevations shown on this FIRM. 504000m E JOINS PANEL 0025 LEGEND SPECIAL FLOOD HAZARD AREAS (SFHAs) SUBJECT TO INUNDATION BY THE 10/0 ANNUAL CHANCE FLOOD 104056'15.00" 40000'00.00" The 1% annual chance flood (100-year flood), also known as the base flood, is the flood that has a 1% chance of being equaled or exceeded in any given year. The Special Flood Hazard Area is the area subject to flooding by the 1% annual chance flood. Areas of Special Flood Hazard include Zones A, AE, AH, AO, AR, A99, V and VE, The Base Flood Elevation is the water-surface elevation of the 1 % annual chance flood. 104058'07.50" 40000'00.00" ZONE X ZONE X ZONE A ZONE AE ZONE AH ZONE X l- W W 0:: ~ CITY OF THORNTON 080007 I- w Z w ~ g: C/) '\661'\-\ (:5 DRIVE 1- ~ 0:: I- W ~ W W W ~ g: C/) I CI) ~'\65TH AVENUE w ~ :r: G J: E 164TH E 164TH AVENUE 4427000m N + 2 E 164TH PLACE ZONE AO ZONE X 6 ZONE AR ZONE A99 ZONE X I- W W ~ C/) l- I- I- W W W ~ W W ~ ~ C/) C/) CI) E 165TH AVENUE :r: z ~ w Iii ~ w 0 ~ ~ ~ ~ ~ ...J ::i (,) Ii: ~ w :E E 164TH AVENUE + 1 ZONE X ZONE V Boundaries of the floodways were computed at cross sections and interpolated between cross sections. The floodways were based on hydraulic considerations with regard to requirements of the National Flood Insurance Program. Floodway widths and other pertinent floodway data are provided in the Flood Insurance Study report for this jurisdiction. Certain areas not in Special Flood Hazard Areas may be protected by flood control structures. Refer to Section 2.4 "Flood Protection Measures" of the Flood Insurance Study report for information on flood control structures for this jurisdiction. ZONE VE w z as ~ ::;l ...J 8 The projection used in the preparation of this map was Universal Transverse Mercator (UTM) zone 13. The horizontal datum was NAD83, GRS1980 spheroid. Differences in datum, spheroid, projection or UTM zones used in the production of FIRMs for adjacent jurisdictions may result in slight positional differences in map features across jurisdiction boundaries. These differences do not affect the accuracy of this FIRM. Flood elevations on this map are referenced to the North American Vertical Datum of 1988. These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. For information regarding conversion between the National Geodetic Vertical Datum of 1929 and the North American Vertical Datum of 1988, visit the National Geodetic Survey website at http://www.ngs.noaa.gov/ or contact the National Geodetic Survey at the following address: ZONE X CJ ZONE X ZONE 0 ~ ADAMS COUNTY UNINCORPORATED AREAS 080001 8 5 ~ o I~~~~I NGS Information Services NOM, N/NGS12 National Geodetic Survey SSMC- 3, #9202 1315 East- West Highway Silver Spring, MD 20910- 3282 U:J o c ~ ~ o ZONE X ................. To obtain current elevation, description, and/or location information for bench marks shown on this map, please contact the Information Services Branch of the National Geodetic Survey at (301) 713.. 3242, or visit its website at http://www.ngs.noaa.gov/. Base map information shown on this FIRM was provided by the Adams County and Commerce City GIS departments. The coordinate system used for the production of the digital FIRM is Universe Transverse Mercator, Zone 13N, referenced to North American Datum of 1983 and the GRS 80 spheroid, Western Hemisphere. NOTE: MAP AREA SHOWN ON THIS PANEL IS LOCATED WITHIN TOWNSHIP 1 SOUTH, RANGE 67 WEST AND TOWNSHIP 1 SOUTH, RANGE 68 WEST. ZONE X This map reflects more detailed and up- to- date stream channel configurations than those shown on the previous FIRM for this jurisdiction. The floodplains and floodways that were transferred from the previous FIRM may have been adjusted to conform to these new stream channel configurations. As a result, the Flood Profiles and Floodway Data tables in the Flood Insurance Study report (which contains authoritative hydraulic data) may reflect stream channel distances that differ from what is shown on this map. Corporate limits shown on this map are based on the best data available at the time of publication. Because changes due to annexations or de- annexations may have occurred after this map was published, map users should contact appropriate community officials to verify current corporate limit locations. No Base Flood Elevations determined. Base Flood Elevations determined. Flood depths of 1 to 3 feet (usually areas of ponding); Base Flood Elevations determined. Flood depths of 1 to 3 feet (usually sheet flow on sloping terrain); average depths determined. For areas of alluvial fan flooding, velocities also determined. Special Flood Hazard Area formerly protected from the 1 % annual chance flood by a flood control system that was subsequently decertified. Zone AR indicates that the former flood control system is being restored to provide protection from the 1 % annual chance or greater flood. Area to be protected from 1 % annual chance flood by a Federal flood protection system under construction; no Base Flood Elevations determined. Coastal flood zone with velodty hazard (wave action); no Base Flood Elevations determined. Coastal flood zone with velocity hazard (wave action); Base Flood Elevations determined. FLOODWAY AREAS IN ZONE AE OTHER FLOOD AREAS Areas of 0.2% annual chance flood; areas of 1% annual chance flood with average depths of less than 1 foot or with drainage areas less than 1 square mile; and areas protected by levees from 1% annual chance flood. OTHER AREAS Areas determined to be outside the 0.2% annual chance floodplain. Areas in which flood hazards are undetermined, but possible. COASTAL BARRIER RESOURCES SYSTEM (CBRS) AREAS OTHERWISE PROTECTED AREAS (OPAs) 97007'30",32022'30" The flood way is the channel of a stream plus any adjacent floodplain areas that must be kept free of encroachment so that the 1% annual chance flood can be carried without substantial increases in flood heights. CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard Areas. Floodplain boundary Floodway boundary Zone D boundary CBRS and OPA boundary Boundary dividing Special Flood Hazard Areas of different Base Flood Elevations, flood depths or flood velocities. "" ... ~ 513 ... v Base Flood Elevation line and value; elevation in feet* (EL 987) Base Flood Elevation value where uniform within zone; elevation in feet* * Referenced to the North American Vertical Datum of 1988 (NAVD 88) @ @ @---------@ 6000000 M II " " " , ,,- Levee Please refer to the separately printed Map Index for an overview map of the county showing the layout of map panels; community map repository addresses; and a Listing of Communities table containing National Flood Insurance Program dates for each community as well as a listing of the panels on which each community is located. 442S000m N + ZONE X <.0 ~ 0 0 ('I') ('I') 0 0 0 t- ~ -' -' w UJ w UJ 0:: Z Z ~ ...J ~ ~ ::;l 0 IX) (/) (/) ~ 7 z Z 0: <5 <5 ~ 0 .., 0 .., ~ 0 c5 (.) 4275000mN DX551 0 x .M1.5 Cross section line Transect line Geographic coordinates referenced to the North American Datum of 1983 (NAD 83) 1000-meter Universal Transverse Mercator grid ticks, zone 13 SOOO-foot grid ticks: Alabama State Plane coordinate system, east zone (FIPSZONE 0101), Transverse Mercator Bench mark (see explanation in Notes to Users section of this FIRM panel) River Mile MAP REPOSITORIES Refer to Map Repositories list on Map Index Contact the FEMA Map Service Center at 1- 800- 358- 9616 for information on available products associated with this FIRM. Available products may include previously issued Letters of Map Change, a Flood Insurance Study report, and/or digital versions of this map. The FEMA Map Service Center may also be reached by Fax at 1- 800- 358- 9620 and its website at http://www.msc.fema.gov/. EFFECTIVE DATE OF COUNTYWIDE FLOOD INSURANCE RATE MAP August 16, 1995 EFFECTIVE DATE(S) OF REVISION(S) TO THIS PANEL March 5, 2007 - to update map format. If you have questions about this map or questions concerning the National Flood Insurance Program in general, please call 1- 877- FEMA MAP (1- 877- 336- 2627) or visit the FEMA website at http://www.fema.gov/. For community map revision history prior to countywide mapping, refer to the Community Map History table located in the Flood Insurance Study report for this jurisdiction. To determine if flood insurance is available in this community, contact your insurance agent or call the National Flood Insurance Program at 1- 800- 638- 6620. . This digital Flood Insurance Rate Map (FIRM) was produced through a cooperative partnership between the State of Colorado Water ConselVation Board, the Urban Drainage and Flood Control District, and the Federal Emergency Management Agency (FEMA). The State of Colorado Water ConselVation Board and the Urban Drainage and Flood Control District have implemented a long-term approach of floodplain management to reduce the costs associated with flooding. As part of this effort, both the State of Colorado and the Urban Drainage and Flood Control District have joined in Cooperating Technical Partner agreements with FEMA to produce this digital FIRM. 11 E 156TH AVENUE Additional flood hazard information and resources are available from local communities, the Colorado Water ConselVation Board, and the Urban Drainage and Flood Control District. ZONE X ZONE X 442S000m N + ZONE X ADAMS COUNTY UNINCORPORATED AREAS 080001 ZONE X E 152NO AVENUE 13 E 1518T STREET I- w 18 ~ ~ z ~~ ~ 0: 00""" 0: (0<.0 ~ 0::0:: 39058'07.50" 104056'15.00" CITY OF THORNTON 080007 39058'07.50" MAP SCALE 1" = 500' 250 0 500 I H H I I 1---1 I-----J I-----J I 150 0 150 1~0~EET I METERS 300 PANEL 0302H I FIRM FLOOD INSURANCE RATE MAP ADAMS COUNTY, COLORADO AND INCORPORATED AREAS PANEL 302 OF 1150 (SEE MAP INDEX FOR FIRM PANEL LAYOUT) CONTAINS: COMMUNITY NUMBER PANEL SUFFIX ADAMS COUNTY THORNTON 1 CITY OF 0302 0302 H H 080001 080007 Notice to User: The Map Number shown below should be used when placing map orders; the Community Number shown above should be used on insurance applications for the subject community. MAP NUMBER 08001C0302H MAP REVISED MARCH 5, 2007 Federal Emergency Management Agency