Winter Steelhead Distribution and Range

 

This CalFish Data Download contains two shapefiles, Winter_Steelhead_Distribution.shp and Winter_Steelhead_Range.shp. Below are the descriptive abstracts for each shapefile followed by links to their complete metadata. Please read the complete metadata before using these datasets.

 

 

Winter Steelhead Distribution Abstract

 

April 2009 Version

 

Data Content:

 

This data set contains all CalWater 2.2.1 Planning Watersheds (PWS) where DFG has documented coho salmon to be present during or after 1990. It was developed for the express purpose of assisting with Coho salmon recovery planning efforts. NOTE: Acreages are calculated for area inside California only.

 

It is important to note that this data set does not attempt to model the entire possible distribution of the species.  Rather, it only represents planning watersheds intersecting the known distribution, which is based on where the species has been observed and reported.  While the distribution data may indeed represent the extent of the species, generally the upstream extent of the distribution only represents the location of positive sampling or other observations..  Therefore, this data set likely represents an underestimation of the absolute geographic distribution of the species.

 

Data Source:

 

This watershed level data set was derived by intersecting Calwater planning watersheds with point and line features depicting Coho salmon distribution. These features are derived from a subset of data contained in the Aquatic Species Observation Database (ASOD), a Microsoft Access multi-species observation data capture application. ASOD is an ongoing project developed by the California Department of Fish and Game (CDFG), Northern Region, Environmental Resources Information Services with assistance from CDFG Biogeographic Data Branch and Pacific States Marine Fisheries Commission. These data are based upon confirmed observations of Coho salmon. Effort has been made to identify and correct watersheds that were erroneously selected due to inaccuracies from using data of different scales. The observation data that are the basis for the distribution were compiled from a variety of disparate sources including but not limited to CDFG, U.S. Forest Service, National Marine Fisheries Service, timber companies, and the public. Forms of documentation include CDFG administrative reports, personal communications with biologists, observation reports, and literature reviews.

 

This derived dataset is meant to be continually updated as additional information is acquired. As such, any copy of this dataset is considered to be a snapshot of the known Coho Distribution at the time of release. It is incumbent upon the user to ensure that they have the most recent version prior to making management or planning decisions.

 

Data Usage:

 

Examples of appropriate uses include:

Coho salmon recovery planning

Evaluation of future survey sites for Coho

Validating Coho distribution models

 

Examples of inappropriate uses include:

Using this data to make parcel or ground level land use management decisions.

Using this data set to prove or support non-existence of coho at any spatial scale.

Assuming that Coho are prevalent throughout the entire watershed.

 

All users of this data should seek the assistance of qualified professionals such as surveyors, hydrologists, or fishery biologists as needed to ensure that such users possess complete, precise, and up to date information on Coho salmon distribution and water body location.

April 2009 Version

 

Data Content:

 

This data set contains all CalWater 2.2.1 Planning Watersheds (PWS) where DFG has documented coho salmon to be present during or after 1990. It was developed for the express purpose of assisting with Coho salmon recovery planning efforts. NOTE: Acreages are calculated for area inside California only.

 

It is important to note that this data set does not attempt to model the entire possible distribution of the species.  Rather, it only represents planning watersheds intersecting the known distribution, which is based on where the species has been observed and reported.  While the distribution data may indeed represent the extent of the species, generally the upstream extent of the distribution only represents the location of positive sampling or other observations..  Therefore, this data set likely represents an underestimation of the absolute geographic distribution of the species.

 

Data Source:

 

This watershed level data set was derived by intersecting Calwater planning watersheds with point and line features depicting Coho salmon distribution. These features are derived from a subset of data contained in the Aquatic Species Observation Database (ASOD), a Microsoft Access multi-species observation data capture application. ASOD is an ongoing project developed by the California Department of Fish and Game (CDFG), Northern Region, Environmental Resources Information Services with assistance from CDFG Biogeographic Data Branch and Pacific States Marine Fisheries Commission. These data are based upon confirmed observations of Coho salmon. Effort has been made to identify and correct watersheds that were erroneously selected due to inaccuracies from using data of different scales. The observation data that are the basis for the distribution were compiled from a variety of disparate sources including but not limited to CDFG, U.S. Forest Service, National Marine Fisheries Service, timber companies, and the public. Forms of documentation include CDFG administrative reports, personal communications with biologists, observation reports, and literature reviews.

 

This derived dataset is meant to be continually updated as additional information is acquired. As such, any copy of this dataset is considered to be a snapshot of the known Coho Distribution at the time of release. It is incumbent upon the user to ensure that they have the most recent version prior to making management or planning decisions.

 

Data Usage:

 

Examples of appropriate uses include:

Coho salmon recovery planning

Evaluation of future survey sites for Coho

Validating Coho distribution models

 

Examples of inappropriate uses include:

Using this data to make parcel or ground level land use management decisions.

Using this data set to prove or support non-existence of coho at any spatial scale.

Assuming that Coho are prevalent throughout the entire watershed.

 

All users of this data should seek the assistance of qualified professionals such as surveyors, hydrologists, or fishery biologists as needed to ensure that such users possess complete, precise, and up to date information on Coho salmon distribution and water body location.

Winter Steelhead Distribution June 2012 Version

 

This dataset depicts observation-based stream-level geographic distribution of anadromous winter-run steelhead trout, Oncorhynchus mykiss irideus (O. mykiss), in California.  It was developed for the express purpose of assisting with steelhead recovery planning efforts.  The distributions reported in this dataset were derived from a subset of the data contained in the Aquatic Species Observation Database (ASOD), a Microsoft Access multi-species observation data capture application.  ASOD is an ongoing project designed to capture as complete a set of statewide inland aquatic vertebrate species observation information as possible.  Please note:  A separate distribution is available for summer-run steelhead.  Contact information is the same as for the above.

 

ASOD Observation data were used to develop a network of stream segments.  These lines are developed by "tracing down" from each observation to the sea using the flow properties of USGS National Hydrography Dataset (NHD) High Resolution hydrography.  Lastly these lines, representing stream segments, were assigned a value of either Anad Present (Anadromous present).  The end result (i.e., this layer) consists of a set of lines representing the distribution of steelhead based on observations in the Aquatic Species Observation Database.

 

This dataset represents stream reaches that are known or believed to be used by steelhead based on steelhead observations.  Thus, it contains only positive steelhead occurrences.  The absence of distribution on a stream does not necessarily indicate that steelhead do not utilize that stream.  Additionally, steelhead may not be found in all streams or reaches each year.  This is due to natural variations in run size, water conditions, and other environmental factors.  The information in this data set should be used as an indicator of steelhead presence/suspected presence at the time of the observation as indicated by the 'Late_Yr' (Latest Year) field attribute.

 

The line features in the dataset may not represent the maximum extent of steelhead on a stream; rather it is important to note that this distribution most likely underestimates the actual distribution of steelhead.  This distribution is based on observations found in the ASOD database.  The individual observations may not have occurred at the upper extent of anadromous occupation.  In addition, no attempt was made to capture every observation of O. mykiss and so it should not be assumed that this dataset is complete for each stream.

 

The distribution dataset was built solely from the ASOD observational data.  No additional data (habitat mapping, barriers data, gradient modeling, etc.) were utilized to either add to or validate the data.  It is very possible that an anadromous observation in this dataset has been recorded above (upstream of) a barrier as identified in the Passage Assessment Database (PAD).  In the near future, we hope to perform a comparative analysis between this dataset and the PAD to identify and resolve all such discrepancies.  Such an analysis will add rigor to and help validate both datasets.

 

For suggested data usage and constraints, citation/contact information and detailed processing and attribute information, please follow this link:

Complete metadata for Winter_Steelhead_Distribution.shp

 

 

 

Winter Steelhead Range Abstract

 

June 2012 Version

 

Data Content:

 

This data set contains all CalWater 2.2.1 Planning Watersheds (PWS) where DFG has documented winter run steelhead to be present during or after 1990. It was developed for the express purpose of assisting with anadromous fish recovery planning efforts. NOTE: Acreages are calculated for area inside California only.

 

It is important to note that this data set does not attempt to model the entire possible distribution of the species.  Rather, it only represents planning watersheds intersecting the known distribution, which is based on where the species has been observed and reported.  While the distribution data may indeed represent the extent of the species, generally the upstream extent of the distribution only represents the location of positive sampling or other observations..  Therefore, this data set likely represents an underestimation of the absolute geographic distribution of the species.

 

Data Source:

 

This watershed level data set was derived by intersecting Calwater planning watersheds with point and line features depicting winter run steelhead distribution. These features are derived from a subset of data contained in the Aquatic Species Observation Database (ASOD), a Microsoft Access multi-species observation data capture application. ASOD is an ongoing project developed by the California Department of Fish and Game (CDFG), Northern Region, Environmental Resource Information Services with assistance from CDFG Biogeographic Data Branch and Pacific States Marine Fisheries Commission. These data are based upon confirmed observations of Coho salmon. Effort has been made to identify and correct watersheds that were erroneously selected due to inaccuracies from using data of different scales. The observation data that are the basis for the distribution were compiled from a variety of disparate sources including but not limited to CDFG, U.S. Forest Service, National Marine Fisheries Service, timber companies, and the public. Forms of documentation include CDFG administrative reports, personal communications with biologists, observation reports, and literature reviews.

 

This derived dataset is meant to be continually updated as additional information is acquired. As such, any copy of this dataset is considered to be a snapshot of the known Winter Run Steelhead Distribution at the time of release. It is incumbent upon the user to ensure that they have the most recent version prior to making management or planning decisions.

 For suggested data usage and constraints, citation/contact information and detailed processing and attribute information, please follow this link:

Complete metadata for Winter_Steelhead_Range.shp