Title: Data set 1: Characteristics of Study Reaches, associated with ‘All Logjams Are Not Created Equal’
Abstract: Logjams create diverse physical and ecological effects in stream channels, including at least temporary storage of water, sediment, and particulate organic matter. We hypothesize that logjams that span the entire bankfull channel width in channels < 25 m wide are more effective in storing these materials than non-channel spanning logjams. We test this hypothesis by systematically comparing characteristics of 183 logjams from 17 stream reaches in the Southern Rocky Mountains. Our dataset is novel in that it evaluates naturally occurring logjams in unaltered streams in a single study area specifically based on whether they span the stream channel. We find that channel-spanning logjams have a significantly larger number of wood pieces, longer & wider pieces, more ramp and bridge pieces, and greater logjam height and volume, both as raw data and when standardized by average channel width. Channel-spanning logjams also have significantly greater backwater pool volume and volume of particulate organic matter stored in backwater pools and in logjams. Restoration employing engineered logjams in relatively small channels currently focuses on non-spanning logjams, but could be expanded to include spanning logjams.
Contact: Bridget Livers
Email and/or phone number for contact person: bridgetlivers@gmail.com
License information or restrictions placed on the data: CC0 (public domain)
Recommended data citation
Format of data files: .csv
Location where data were collected: Rocky Mountain National Park, Colorado, USA; Lat: 40.3333, Long: -105.7000
Time period during which data were collected: 2013-06-01 to 2013-07-31; 2014-06-01 to 2014-07-31 
File Information: File name ‘Dataset S1’. One dataset as a table, raw and calculated data.
Variable information: 
* Reach Name: name used for segment of stream surveyed (reach); usually an abbreviation of stream name; CONYc = Cony Creek (confined reach), CONYu = Cony Creek (unconfined reach), GC = Glacier Creek, GLACIERu = Glacier Creek (unconfined reach), HUNTERSc = Hunters Creek (confined reach), HUNTERSu = Hunters Creek (unconfined reach), MILLc = Mill Creek (confined reach), MILLu = Mill Creek (unconfined reach), NSVC = North St. Vrain Creek (confined), NSVH = North St. Vrain Creek (highest unconfined reach), NSVL = North St. Vrain Creek (lower unconfined reach), NSVpc = North St. Vrain Creek (partly confined reach), NSVU = North St. Vrain Creek (middle unconfined reach), OUZELa-c,u = Ouzel Creek reaches (letters not representative of other descriptors)
* Stand age category: age of riparian forest; OU = old growth, YU = younger forest
* Channel planform: describes whether reach is a single channel (single-thread) or has multiple, parallel channels (multithread) 	
* Confinement (cat.): describes how confined stream reach is within its valley, determined by mean valley width/mean stream width; confined = confinement <3, partly confined = confinement between 3-8, unconfined = confinement >8
* DA (km2): drainage area of upstream end of stream reach, in square kilometers; acquired using USGS Stream Stats (Ries et al., 2017)
* Mean gradient (m/m): mean gradient of stream reach from several measurements	
* Mean valley width (m): mean width of stream valley from several measurements	
* Mean ind. channel width (m): mean individual channel width from several measurements, accounts for width of each channel in multithread stream segments	
* Mean total channel width (m): for single-thread reaches: mean individual channel width from several measurements; for multithread reaches: mean of summed total channel width as measured across transect perpendicular to flow, each sampling transect having one total width value
* Mean forest cover (basal area, m2/ha): measured with Panama basal area angle gage, which uses counted number of trees from stream bank, averaged from several measurements
* Number of jams: total number of logjams in stream reach
* Jams/100m channel length (#): normalized number of logjams per 100m of reach length using total stream reach length	
* Jams/ 100m valley (#): normalized number of logjams per 100m of valley using total valley length	
* Total channel length (main + secondary; m): total length of all stream channels in reach	
* Valley length (m): total length of valley occupied by stream reach; oriented with stream flow, streams often have longer lengths than their valleys due to meandering	
* Proportion wood in jams (by volume): total volume of wood found in logjams in reach divided by the total wood volume for the entire reach (this includes individual pieces of wood not in logjams)	
* Proportion wood pieces in jams: total pieces of wood found in logjams in reach divided by the total wood pieces for the entire reach (this includes individual pieces of wood not in logjams)	
* Proportion of channel-spanning jams: number of channel spanning logjams in reach divided by total number of logjams in reach (includes non-spanning logjams)
Method(s): Unless otherwise noted in ‘Variable information’, data was collected with a TruPulse 350B laser rangefinder with horizontal accuracy of +/- 0.1m or measured by hand with measuring tape. Data was inputted into Microsoft Excel to attain means, proportions, values normalized by length, and volumes of wood using the formula for a cylinder using measured average diameter and length of wood pieces. Detailed methods described in Livers and Wohl, 2016, Table 1:
Livers, B., and E. Wohl, 2016. Sources and interpretation of channel complexity in forested subalpine streams of the Southern Rocky Mountains. Water Resources Research 52, 3910-3929. https://doi.org/10.1002/2015WR018306.
Software: All data are raw data or summed or averaged data using Microsoft excel 
Limitations to reuse: None
Are there multiple versions of the dataset? No
Related materials: Data set 2: Logjam data, associated with ‘All Logjams Are Not Created Equal’
Data source: Ries, K.G., III, Newson J.K., Smith, M.J., Guthrie, J.D., Steeves, P.A., Haluska, T.L., Kolb, K.R., Thompson, R.F., Santoro, R.D., and Vraga, H.W., 2017, StreamStats, version 4: U.S. Geological Survey Fact 2017–3046, 4 p., https://doi.org/10.3133/fs20173046. [Supersedes USGS Fact Sheet 2008–3067.]
Related Files: None