File Geodatabase Feature Class
Tags
aquatic, fish, fisheries, instream, habitat, hydrologic, hydrography, restoration, river, basin, planning, steelhead, stream, surveys, salmonids, coho, Chinook, watershed, Oncorhynchus, kisutch, mykiss, tshawytscha, environment, biota, inland waters, North Coast, Albion River, Bear River, Big River, Caspar Creek, Cottaneva Creek, Eel River, Elk River, Gualala River, Jacoby Creek, Mad River, Mattole River, Navarro River, Noyo River, Oil Creek, Redwood Creek, Russian River, Singley Creek, Smith River, Trinity River, Usal Creek, Van Duzen River, Del Norte County, Glenn County, Humboldt County, Lake County, Mendocino County, Sonoma County, Trinity County, environment, biota, inlandWaters
The database is designed to be used in conjunction with biological inventories and adult salmonid escapement surveys conducted later in the same year. The data were collected by Department of Fish and Wildlife primarily to: 1) provide a useful source of information for evaluating, designing and monitoring stream habitat improvements for salmonids based on critical fish habitat needs, and 2) aid in internal management decisions regarding stream restoration projects and potential. DATA LIMITATIONS AND ASSUMPTIONS: For analytical purposes, users should assume that data collection methods were similar enough between streams, years, and observers to allow comparison of relative values. Observer bias is presumed to be low to non-existent. Unit-level in-stream habitat data are designed for suitability assessment of salmonid habitat at fine scales (stream segment). They should not be used for large watershed-level assessment tasks since sampling designs were not established for that purpose. In addition, the shapefiles comprising this data set are a visual representation of the data and have not been calibrated to existing stream data. Therefore spatial errors should be expected. KNOWN CAVEATS OF THE DATA: A large number of data entry errors exist for several surveys and are awaiting correction by regional staff. A significant scaling error often occurs in these data. Some of this error could be from mapping fine-scale ground measurements to a coarser map scale. The average in-stream habitat unit is approximately 55 feet (17 m) long while 1:24,000 scale maps may be accurate to the nearest 90 feet (30 m). In most cases, distances measured at a fine scale will exceed measurements at a course scale (Mandelbrot 1982). With this and other errors, habitat units for some streams may not be accurately placed on the map. From the starting point, uncertainty of placement of habitat units on the map increases with distance upstream. In many cases, the scaling error caused the length of the stream as measured in the surveys to exceed the apparent stream length mapped on the hydrography. For these instances, a scaling factor was applied automatically by the NCNCR 'Stream Habitat' application (contact Karen Wilson, KLWilson@dfg.ca.gov, for information on this program). Even after application of the scaling factor, instances of the length discrepancy exceeding 1,000 feet were found in the data where the surveys covered several miles. Habitat conditions can change drastically both from year to year and within a season. Some of the factors to consider are variable stream flows (especially flood events), temperatures, and silt loads. Use of the data with other time-dependent data such as stream biological inventories and salmon carcass surveys must be done with caution.
The StreamHabitat_NorthCoastIV shapefile helps identify and describe in-stream habitat available to anadromous salmonids within surveyed watersheds. The database contains 820 in-stream surveys ("habitat unit" level) collected on 667 streams of the California North Coast Hydrologic Region from 1989 to 2004, with most of the surveys conducted in 1995 and 1996. Approximately 2029 miles of streams were surveyed or re-surveyed. This shapefile was derived by combining the StreamHabitat_NorthCoast, StreamHabitat_NorthCoast_II, and StreamHabitat_NorthCoast_III shapefiles, removing duplicate surveys and correcting some of the known errors.
WHAT EACH RECORD REPRESENTS: Each record represents in-stream habitat attributes measured at the habitat unit level. A habitat unit is the base level for stream habitat surveys and is generally determined by the occurrence of riffle, run and pool sections along the stream. Stream inventory reports are available for several surveys. Links to the pdf-formatted reports can be found in the "Report" field of the attribute table.
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Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
In accordance with the California Salmonid Stream Habitat Restoration Manual.
Extent
| West | -124.483447 | East | -122.564872 |
| North | 41.772468 | South | 38.348108 |
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
In accordance with the California Salmonid Stream Habitat Restoration Manual.