File Geodatabase Feature Class
Tags
Coho, Salmon, Anadromous, Endangered Species, Threatened Species, Species Recovery, Recovery Planning, biota, environment, inlandWaters
To map coho salmon observation based distribution in California to assist in Coho salmon recovery planning efforts.
November 2022 Version
This is the CDFW Internal Edition of the Coho Distribution dataset. This dataset is for internal use only. Note that there is also a Public Version of this dataset in BIOS from which sensitive and disputed information has been removed. The Public Version is available outside the Department via CalFish.
This dataset depicts observation-based stream-level geographic distribution of coho salmon in California. It was developed for the express purpose of assisting with coho salmon recovery planning efforts.
This distribution network was developed using custom tools and procedures developed by California Department of Fish and Wildlife (CDFW) Northern Region Data Management and GIS. The result consists of a set of lines representing the distribution of coho based on observations compiled and maintained in the developer's file geodatabase (Environmental Science Research Institute (ESRI) 2016). These lines are developed by "tracing down" from each observation to the sea using the flow properties of California Streams, a CDFW derivative of USGS National Hydrography Dataset (NHD) High Resolution hydrography.
The individual features in this dataset represent stream segments that are known or believed to be used by coho salmon determined by observation locations mapped along these segments. Observation qualifiers associated with these locations determine time and quality assertions that are translated to the linear distributions classification system (see the Entity Attribute section of this metadata for more information on the classification system used).
As explained above, this dataset displays stream segments based on points where coho observations have been reported, hence it contains positive distribution only. However, coho may not be found on an annual basis on these reaches 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 coho presence/suspected presence at the time of the observation; it does not necessarily verify that coho are currently present. Conversely, the absence of distribution on a stream does not necessarily indicate that coho do not utilize that stream.
The line features in the dataset do not represent the maximum extent of coho on a stream; rather it is important to note that this data underestimates the actual distribution of coho salmon for these reasons; an observation does not necessarily occur at the upper extent of a coho's travels; the dataset will be updated as additional information is acquired, yet, time and resource constraints prevent the developers of the dataset from capturing all coho observations in existence; as environmental conditions change over time coho distribution will probably change as well. As such, any copy of this dataset is considered to be a snapshot of coho distribution at the time of release. It is impingent upon the user to ensure that they have the most recent version prior to making management or planning decisions.
This dataset was built solely from observational data: no additional data (habitat mapping, barriers data, gradient modeling, etc.) were utilized to either add to or validate the data. Several instances have been noted where a coho 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.
The file geodatabase observation locations are compiled from a variety of disparate sources including but not limited to CDFW, USFS, NMFS, timber companies, and the public. Forms of documentation include CDFW administrative reports, personal communications with biologists, observation reports, and literature reviews. The source of each feature (to the best available knowledge) is included in the data attributes. The spatial data has been referenced to California Streams.
Usage of this dataset:
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:
- Assuming absence of a line feature means that coho are not present in that stream.
- Using this data to make parcel or ground level land use management decisions.
- Using this dataset to prove or support non-existence of coho at any spatial scale.
- Assuming that the line feature represents the maximum possible extent of coho range.
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.
Please refer to "Use Constraints" section below.
Eric Haney CDFG, Connie Shannon PSMFC, Tom Christy CDFG NR ERIS, Robin Mackey PSMFC
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.
Please read the metadata document completely prior to use of this dataset.
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:
- Assuming absence of a point feature means that coho are not present in that stream.
- Using this data to make parcel or ground level land use management decisions.
- Using this dataset to prove or support non-existence of coho at any spatial scale.
- Assuming that the point feature represents the maximum possible extent of coho range.
This data attempts to show the latest available observations for coho Salmon in Calfornia, where such information is known. Please note this data is a work in progress and is subject to change/update as new information becomes available. This data contains observations currently entered into ASOD and should NOT be assumed to be all known observations. It is complete as far as time and resources have enabled it to be at this point in time, but as a result of these limitations underestimates the actual distribution of coho salmon observations. Its purpose is to be a guide for future management and planning.
Spatial data has been mapped to USGS National Hydrography Dataset (NHD) High Resolution hydrography. This is NOTan all-inclusive data set of coho salmon observations, as additional streams may exist that are not mapped on either of these sources. Similarly, not every stream that has been mapped has been studied rigorously enough to be definitively ruled out as a coho stream. Because of the inherent inaccuracies involved when mapping data at different scales, moving point features generated from coordinates or digitizing to the hydrography, translating data from textual descriptions as well as from personal interviews, this dataset is not accurate enough to support parcel level analyses; it is suitable for watershed level uses only.
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.
Extent
| West | -124.498969 | East | -121.891568 |
| North | 42.598414 | South | 36.907343 |
| 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.
Please read the metadata document completely prior to use of this dataset.
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:
- Assuming absence of a point feature means that coho are not present in that stream.
- Using this data to make parcel or ground level land use management decisions.
- Using this dataset to prove or support non-existence of coho at any spatial scale.
- Assuming that the point feature represents the maximum possible extent of coho range.
This data attempts to show the latest available observations for coho Salmon in Calfornia, where such information is known. Please note this data is a work in progress and is subject to change/update as new information becomes available. This data contains observations currently entered into ASOD and should NOT be assumed to be all known observations. It is complete as far as time and resources have enabled it to be at this point in time, but as a result of these limitations underestimates the actual distribution of coho salmon observations. Its purpose is to be a guide for future management and planning.
Spatial data has been mapped to USGS National Hydrography Dataset (NHD) High Resolution hydrography. This is NOTan all-inclusive data set of coho salmon observations, as additional streams may exist that are not mapped on either of these sources. Similarly, not every stream that has been mapped has been studied rigorously enough to be definitively ruled out as a coho stream. Because of the inherent inaccuracies involved when mapping data at different scales, moving point features generated from coordinates or digitizing to the hydrography, translating data from textual descriptions as well as from personal interviews, this dataset is not accurate enough to support parcel level analyses; it is suitable for watershed level uses only.
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.