This map displays turbidity monitoring stations and cross sections in the Elk River watershed. Overlaid are geology and landslide data from the California Geological Survey and historical maps from NOAA. The purpose of the map is to show the location of monitoring stations where there is a high risk of landslides or there has been an occurrence of landslides.This map is featured in the 2019 Water Quality Status Report. Data sources: Monitoring stations and cross sections - North Coast Regional Water Quality Control BoardGeneralized Rock Types - CA Department of Conservation (California Geological Survey)Landslide Susceptibility - CA Department of Conservation (California Geological Survey)Landslide Inventory (Older) - CA Department of Conservation (California Geological Survey)Landslide Inventory (Younger) - CA Department of Conservation (California Geological Survey)Historical maps (1916-1969) - National Oceanic and Atmospheric Administration (NOAA)NHDPlus Flowlines and watershed boundary - U.S. Geological SurveyCreated by: Lance LeNorth Coast Regional Water Quality Control Boardlance.le@waterboards.ca.govMaintained by: Michelle TangSurface Water Ambient Monitoring Program (SWAMP)State Water Resources Control Boardmichelle.tang@waterboards.ca.govDisclaimer & Access Use Constraints:This data may change at any time and should not be used for any purpose other than general reference.

The project lead for the collection of this data was Carrington Hilson. Elk (15 adult females) were captured and equipped with GPS collars (Lotek Iridium) transmitting data from 2018-2021. The Mad River herd does not migrate between traditional summer and winter seasonal ranges. Therefore, annual home ranges were modeled using year-round data to demarcate high use areas in lieu of modeling the specific winter ranges commonly seen in other ungulate analyses in California. GPS locations were fixed between 1-6 hour intervals in the dataset. To improve the quality of the data set as per Bjørneraas et al. (2010), the GPS data were filtered prior to analysis to remove locations which were: i) further from either the previous point or subsequent point than an individual pronghorn is able to travel in the elapsed time, ii) forming spikes in the movement trajectory based on outgoing and incoming speeds and turning angles sharper than a predefined threshold , or iii) fixed in 2D space and visually assessed as a bad fix by the analyst. The methodology used for this migration analysis allowed for the mapping of the herd''s home range. Brownian bridge movement models (BBMMs; Sawyer et al. 2009) were constructed with GPS collar data from 11 elk, including 23 annual home range sequences, location, date, time, and average location error as inputs in Migration Mapper. BBMMs were produced at a spatial resolution of 50 m using a sequential fix interval of less than 27 hours. Large water bodies were clipped from the final output. Home range is visualized as the 50th percentile contour (high use) and the 99th percentile contour of the year-round utilization distribution. Home range designations for this herd may expand with a larger sample.

These data were automated to provide an accurate high-resolution historical shoreline of Elk River, MD suitable as a geographic information system (GIS) data layer. These data are derived from shoreline maps that were produced by the NOAA National Ocean Service including its predecessor agencies which were based on an office interpretation of imagery and/or field survey. The NGS attribution scheme 'Coastal Cartographic Object Attribute Source Table (C-COAST)' was developed to conform the attribution of various sources of shoreline data into one attribution catalog. C-COAST is not a recognized standard, but was influenced by the International Hydrographic Organization's S-57 Object-Attribute standard so the data would be more accurately translated into S-57. This resource is a member of https://inport.nmfs.noaa.gov/inport/item/39808

These flood extent maps are produced using the USACE FESM method to approximate flood extents. This model does not account for physical processes considered using more technical hydraulic modeling approaches. These flood extents are directly dependent on the water level of the Elk River near Fayetteville river gauge, and do not accurately account for backwater on tributaries. For questions about the use of this interface, contact: laurel.mccoy@noaa.gov