Lower Boise River Miles (2015)

This is a point data set representing river miles of the main channel of the Lower Boise River created by the City of Boise Public Works Department. The points are approximately 1/10th of a mile apart from each other for flexibility in landmark identification and model node selection (used in analysis). A river mile is a relative measure of the navigable distances in the deepest part of the channel. It is the distance in miles along a river from its mouth. River mile numbers begin at zero and increase further upstream. The data set was created by digitizing 1/10th of a mile measurements along the river channel using 2015 Idaho NAIP Imagery (1-meter resolution) at a 1:3000 scale or finer. As newer high-quality aerial imagery becomes available, a new version of the dataset will be created to reflect changes in the main channel over time and made available here. We are currently working on a 2017 version. For more information about this dataset, please contact Darcy Sharp, City of Boise Public Works Environmental Data Analyst, [e-mail]. Data Usage: If you download this dataset, it is highly recommended that you keep track of the year of imagery the dataset is correlated to, in this case it is 2015. As newer NAIP imagery becomes available, we will release a newer version of this dataset. It is especially important to cite the year if this dataset will be used in published documents so readers are clear on which vintage of the dataset was used in cartographic products, for analyses, etc. Data and Attribute Creation Information: The National Hydrography Dataset (NHD) is not used for this river mile layer. The NHD layer includes alternative side channels, ephemeral tributaries, and other river features that result in a high river mileage tally. NHD often uses contours to predict where the stream should be but does not connect that to actual flowing water. Features in this data set were created via heads-up digitizing. This data set is subject to errors in source data accuracy and errors introduced in the digitizing process. Source data includes: River Mile locations - 2015 Natural Color and IR 1-meter NAIP Idaho aerial imagery River Reach (local landmark) values - USGS (https://waterdata.usgs.gov/id/nwis/ for HUC 17050114) Site Identification numbers, IDWR Site Identification Numbers(https://research.idwr.idaho.gov/apps/Hydrologic/Accounting/ for the Boise River System), Idaho Department of Environmental Quality water quality assessments (https://cloud.insideidaho.org), and Idaho Department of Fish and Game fishing and boating access sites (https://data-idfggis.opendata.arcgis.com/datasets/idfg-fishing-and-boating-access-sites) DEQ Assessment Units - assigned by referencing the DEQ Integrated Report found at https://mapcase.deq.idaho.gov/wq2014/ Elevation values - grdn44w117_13 raster downloaded from the US Geological Survey digital elevation model available on The National Map at https://viewer.nationalmap.gov/basic/ Latitude and Longitude values - calculated using GIS