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Floodplain Cross Sections
open.piercecountywa.gov | Last Updated 2024-04-24T22:09:45.000ZThis is 2017 DFIRM Data for cross section lines. New to the DFIRM data is the coastal flood study, that adds Velocity Zones (VE) along Puget Sound and the Seclusion Boundary. Seclusion areas are located where floodplains are affected by non-accredited levees and retain 1970s modeled flood hazards. These lines show the locations of channel surveys used to calculate flood elevations in the hydraulic models. The Cross Sections are also shown on the Flood Profiles in the Flood Insurance Study (FIS) report and can be used to cross reference the Flood Profiles to the planimetric depiction of the flood hazards. All cross sections for which a spatial location is available should be included in the S_XS table. The Cross Sections are lines generally extending from outside the floodplain, across the entire floodplain and out the other side. In this data set the cross sections have been trimmed to include only the areas show to be in a flood hazard area. Each cross section is represented by a line feature. The line has been split where the modeling shows a different base flood elevation than the stream center on the left or right bank (reference 2017 FIS Volume 2). The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event (Zones A & V), the 0.2-percent-annual- chance flood event (Zone X shaded), areas of undetermined flood risk (Zone X shaded) and areas of minimal flood risk (Zone X unshaded). The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the UTM projection and coordinate system. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000. Please read metadata for additional information(https://matterhorn.co.pierce.wa.us/GISmetadata/pdbswm_regulated_floodplain_x_sections.html). Any data download constitutes acceptance of the Terms of Use (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf).
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Floodplain Seclusion Areas
open.piercecountywa.gov | Last Updated 2024-06-18T11:12:49.000ZAreas within the seclusion boundary retain the mapping and flood hazard analysis from the 1970s that appears on FIRMs issued to Pierce County communities from 1980 to 1987. Seclusion boundaries are shown in Unincorporated Pierce County, Tacoma, Port of Tacoma, Fife, Puyallup and Orting. This is due to the presents of levees that affect flooding but are not certified or accredited to protect areas behind them from the 1% Annual Chance Flood per 44 CFR 65.10. While FEMA develops a new engineering and mapping standard for these levees no new adoption of flood risk hazards will occur in the secluded areas. Flood hazards shown on original FIRMs have been digitized into this preliminary DFIRM and previously approved LOMRs have been incorporated. This is the 2017 DFIRM Data showing areas of at risk of flooding. New to the DFIRM data set from 2009 is the a coastal flood study, that adds Velocity Zones (VE) along Puget Sound and Seclusion Boundary in areas affected by non-accredited levees retain 1970s modeled flood hazards. **This data is for informational purposes only - for regulated flood hazard areas see "Regulated Floodplain 2017” The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the UTM projection and coordinate system. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000. Please read metadata for additional information (https://matterhorn.co.pierce.wa.us/GISmetadata/pdbswm_regulated_seclusion_area.html). Any data download constitutes acceptance of the Terms of Use (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf).
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Contour Index
open.piercecountywa.gov | Last Updated 2024-06-18T11:18:07.000Z<DIV STYLE="text-align:Left;font-size:12pt"><P><SPAN>This dataset provides a 15000 x15000 index grid used to split up the 2020 contour data into manageable sized shapefiles for download in the Pierce County Open GeoSpatial Data Portal. Some files are larger than others and may take some time to download. Please read the contour metadata before using. </SPAN></P><P><SPAN /></P><P><SPAN>Please read metadata for additional information (https://matterhorn.piercecountywa.gov/GISmetadata/condbit_contour_index_2020.html). Any use or data download constitutes acceptance of the Terms of Use (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf).</SPAN></P></DIV>
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Shoreline Environment Designations
open.piercecountywa.gov | Last Updated 2024-06-18T11:20:30.000ZPolygons representing shorelines in unincorporated Pierce County that need to be protected, restored, and preserved. These shorelines are included in the shoreline management plan for Pierce County. Please read metadata for additional information (https://matterhorn.co.pierce.wa.us/GISmetadata/pdbplan_shoreline_environment_designations.html). Any data download constitutes acceptance of the Terms of Use (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf).
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Waste Water Treatment Plants
open.piercecountywa.gov | Last Updated 2024-06-18T11:18:23.000ZPoints representing the Waste Water Treatment Plants in Pierce County. Please read the metadata (https://matterhorn.co.pierce.wa.us/GISmetadata/pdbsewr_water_treatment_plants.html) for additional information. Any data download constitutes acceptance of the Terms of Use (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf).
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Marine Shoreline Critical Salmon Habitat
open.piercecountywa.gov | Last Updated 2024-06-18T11:13:08.000ZProperty polygons in unincorporated Pierce County considered within 100' of "high quality salmon habitat shoreline areas" using the Nearshore Salmon Habitat Assessment. Please read metadata for additional information (https://matterhorn.co.pierce.wa.us/GISmetadata/pdbplan_marine_shrln_crit_salmon_hab.html). Any data download constitutes acceptance of the Terms of Use (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf).
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Hydro - Centerlines
open.piercecountywa.gov | Last Updated 2024-06-18T11:26:04.000Z<DIV STYLE="text-align:Left;font-size:12pt"><DIV><DIV><P><SPAN>This feature class shows streams, centerlines of rivers, centerlines of water bodies, culverts and pipes, and subterranean features. It is an accurate hydrology feature class that was built using the 2011 LIDAR provided by the Puget Sound Lidar Consortium. Also utilized were a combination of orthophotography for both current and historical uses, 2-foot contours (created by the 2011 LIDAR), Department of Natural Resources stream centerlines, adjacent county stream centerlines, and GPS drainage inventory. Each of the sources served a different purpose and combined created more accurate hydrology data for mapping and analysis. All streams manually created. The determination of stream location relied heavily on the 2011 LIDAR and contours while at 1:600 scale or better. After the initial stream creation was completed, the lower quality Department of Natural Resources (DNR) streams were edge-matched to this more accurate Pierce County hydrology layer in Eastern Pierce County around Mount Rainier. Adjacent county streams were edge-matched to the more accurate Pierce County hydrology at Pierce County’s boundary. Please read metadata (https://matterhorn.piercecountywa.gov/GISmetadata/pdbswm_hydro_streams.html) for additional information. Any use or data download constitutes acceptance of the Terms of Use (https://matterhorn.piercecountywa.gov/disclaimer/PierceCountyGISDataTermsofUse.pdf). </SPAN></P></DIV></DIV></DIV>
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Hydro - Puget Sound
open.piercecountywa.gov | Last Updated 2024-06-18T11:09:21.000ZThis polygon identifies the Puget Sound Shoreline in Pierce County. This data was created using 2-foot contours from the 2011 LiDAR data. The 10-foot elevation was chosen as the primary shoreline boundary. Please read metadata (https://matterhorn.co.pierce.wa.us/GISmetadata/pdbswm_hydro_pugetsound.html) for additional information. Any data download constitutes acceptance of the Terms of Use. (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf)
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Hydro Puget Sound generalized
open.piercecountywa.gov | Last Updated 2024-06-18T11:12:44.000ZThis polygon identifies the Puget Sound Shoreline in Pierce County. This data was created using 2-foot contours from the 2011 LIDAR data. The 10-foot elevation was chosen as the primary shoreline boundary. It was then generalized using a 5 foot vertex interval. Please read metadata (https://matterhorn.co.pierce.wa.us/GISmetadata/pdbswm_hydro_pugetsound_generalized.html) for additional information. Any data download constitutes acceptance of the Terms of Use. (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf)
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Watersheds
open.piercecountywa.gov | Last Updated 2024-06-18T12:49:14.000ZThe County’s National Pollutant Discharge Elimination System and State Waste Discharge General Permit (NPDES) permit requires that Pierce County maintain mapping data for all known MS4 outfalls and discharge points. The permit requires basin delineation for all tributary conveyances to all known outfalls and discharge points with a 24-inch nominal diameter or larger, or an equivalent cross-sectional area for non-pipe systems.In September 2016, Pierce County Department of Public Works (County) hired Herrera Environmental Consultants (Herrera) to delineate watershed and drainage basin boundaries in GIS to meet the mapping requirements of the current NPDES Phase I Municipal Stormwater Permit. In 2017, Herrera produced an amendment to the original SOW to assist the County with a) conducting a review of 570 existing mapped outfall and discharge points for accuracy and completeness and b)mapping all remaining outfall and discharge points within Pierce County (excluding cities).Herrera has produced a Technical Memorandum documenting all methods and results entitled “Pierce County Drainage Basin and Watershed Delineation Summary Memorandum” (dated December 28, 2017). Please read metadata for additional information (https://matterhorn.co.pierce.wa.us/GISmetadata/pdbswm_watersheds_hec.html). Any data download constitutes acceptance of the Terms of Use (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf).