• Sherri L. Johnson - Principal Investigator
  US Forest Service ;Pacific NW Research Station ;3200 SW Jefferson Way, Corvallis, OR, 97331, USA
  Phone: 541-758-7771
  Email: sherri.johnson2@usda.gov, sherri.johnson@oregonstate.edu
  URL: https://www.fs.fed.us/research/people/profile.php?alias=sherrijohnson
• Julia A. Jones - Principal Investigator
  Oregon State University;Department of Geosciences; Wilkinson Hall 104, Corvallis, OR, 97331-5506, USA
  Phone: (541) 737-1224
  Email: Julia.Jones@oregonstate.edu, geojulia@comcast.net
  URL: http://ceoas.oregonstate.edu/profile/jones/
  ORCID: http://orcid.org/0000-0001-9429-8925
• Hannah Gosnell - Principal Investigator
  Geosciences;Oregon State University;260 Wilkinson Hall, Corvallis, OR, 97331-5506, USA
  Phone: 541-737-1222
  Email: gosnellh@geo.oregonstate.edu
  URL: http://ceoas.oregonstate.edu/profile/gosnell/
• Matthew G Betts - Principal Investigator
  Department of Forest Ecosystems and Society; 201E Richardson Hall; College of Forestry; Oregon State University, Corvallis, OR, 97331
  Phone: (541) 737-3841
  Email: matt.betts@oregonstate.edu
  URL: http://www.fsl.orst.edu/flel/index.htm
• Michael P. Nelson - Principal Investigator
  Department of Forest Ecosystems and Society; 201K Richarson Hall; College of Forestry; Oregon State University, Corvallis, OR, 97331
  Phone: 541-737-9221
  Email: mpnelson@oregonstate.edu
  URL: http://www.michaelpnelson.com
  ORCID: http://orcid.org/0000-0001-6917-4752

• H. J. Andrews Experimental Forest
  The Andrews Forest is situated in the western Cascade Range of Oregon, and covers the entire 15,800-acre (6400-ha) drainage basin of Lookout Creek. Elevation ranges from 1350 to 5340 feet (410 to 1630 m). Broadly representative of the rugged mountainous landscape of the Pacific Northwest, the Andrews Forest contains excellent examples of the region's conifer forests and associated wildlife and stream ecosystems. These forests are among the tallest and most productive in the world, with tree heights of often greater than 250 ft (75 m). Streams are steep, cold and clean, providing habitat for numerous aquatic organisms.

• The length of stream sampled at each site ranged from 0.4 to 2 km and was determined by the distance required to locate 30 trees (sources) that had provided pieces of coarse woody debris to the stream; minimum diameters were greater than 10 cm at the small end and lengths were greater than 1 m. Coarse debris includes tree tops, large limbs, fragments of snags, and whole trees. Sample size (30) was a compromise between the need to properly characterize a site and to keep stream length short enough that geomorphic conditions (e.g., stream order, floodplain width) would not vary greatly. The origin of each piece of debris within or straddling the stream was determined. Pieces not identifiable as to source (47.7% of pieces encountered at the study sites) were not included in the study; they were usually short fragments that were quite mobile at high flows. Source distance was measured from the origin to the stream bank along a line perpendicular to the channel. To evaluate the distance moved downslope by debris, we also measured the origin to piece distance (Fig. 1). Separate measurements were made of distances on bench and hillslope areas and then summed to give a total slope distance from origin to stream (source distance) or origin to piece, ass appropriate. A bench was defined as the relatively flat floodplain and terraces adjacent to the stream. Side-slope steepness was measured with a hand-held clinometer. Species diameter, total piece length, and length actually in channel were recorded for pieces with discernible origins. In cases of uprooted trees, the distance from the center of the root pit to the stream bank was measured. In cases where a fallen tree delivered more than one piece of debris to the stream, all of these pieces were inventoried separately, but their source was counted as one. Debris pieces that straddled the stream but were identifiable as to source location were included in the study because they will eventually enter the steam.

• The 39 study sites, 37 in the Cascade Range of Oregon and Washington and 2 in the Coast Range of Oregon, are located within 8 study areas. Streams at the study sites range in size from first through third order; all of the sampled stream sites are in natural, well-stocked stands. Approximately half the sites are in old-growth stands, and half are in unmanaged, mature stands. Legal descriptions of locations and other site characteristics are available in McDade (1987). Streams sampled in the Oregon coast Range are Calf Creek and Flynn Creek. Calf Creek, only 2.5 km from the Pacific Ocean lies within forests dominated by Sitka spruce and western hemlock of about 140 years. Flynn Creek is located 16 km east of the Pacific Ocean in the Tsuga heterophyllas Zone. Douglas-fir and western hemlock dominate the forest canopy. Red alder is common along both streams.
• Twenty-seven of the Cascade Range streams are in the central western Cascades of Oregon, in the H.J. Andrews Experimental Forest or in the nearby Hagan Block and Middle Santiam research natural areas and Three Sisters Wilderness Area. Nine of the remaining Cascade streams are close t the Wind River Experimental Forest near Carson, Washington, and one is in Mount Rainier National Park. Forests bordering the streams are dominated by Douglas-fir, western hemlock, and western red cedar, which are characteristic of the Tsuga heterophylla Zone.
• Valleys in both the Cascade and Coast ranges are typically V-shaped with steep side slopes and narrow valley floors along first through third order streams. Hillslopes adjacent to sampled streams range in steepness from 3 to 40 degrees, with first and second order streams having significantly steeper side slopes than third-order streams.

• Each study site was classified in terms of stream order (firs, second, or third), stand age (old-growth or mature timber), and average steepness of side slopes (steep slopes >25 degrees, gentle slopes less than 25 degrees). These characteristics were pre-established so that selected sites would fit a 3 X 2 X 2 factorial design with a minimum of three sample sites (replicates) in each cell of the matrix. The choice of 25 degrees for categorizing slope steepness was based on our field observations that conspicuous sliding occurs primarily on slopes steeper than 25-30 degrees. A total of 1258 debris pieces ere sampled: 619 conifer and 2 hardwood pieces in old-growth stands and 551 conifer and 86 hardwood pieces in mature stands.
• Dependent variables (Table 1) had highly skewed distributions, and nonparametric methods were used throughout to test for location differences among distributions classified by various stand and geomorphic attributes.

• Andrews Experimental Forest (HJA)
  W -122.26172200, E -122.10084700, N 44.28196400, S 44.19770400
  Altitude: 1631 to 1631 meter
• Cascade Head Experimental Forest
  W -123.99172777, E -123.89730000, N 45.06476948, S 45.03130000
• Mt. Rainier National Park
  W -121.91194510, E -121.53641010, N 46.94590700, S 46.75970700
• Reference Watershed HGBK, Hagan RNA, Willamette NF
  W -122.41884666, E -122.41884666, N 44.18318777, S 44.18318777
  Altitude: 653 to 653 meter
• Carpenter Mountain Area, Blue River Ranger District, OR
  W -122.16422300, E -122.16134500, N 44.27784300, S 44.27616900
  Altitude: 1628 to 1628 meter

Object name: TD01001.csv

Records: 1258

Attributes: 31

File size: 138816 byte

Checksum (MD5): 8c9a97a4bdb345e31123ff491845ab98

Format: headers=1, recordDelimiter=\r\n, fieldDelimiter=,, quoteCharacter=", orientation=column