The habitat unit dataset provides all of the information collected at the unit level by the stream survey crew. Habitat units are the building blocks of reaches. Each unit is longer than one active channel width and is an area of relatively homogeneous slope, depth, and flow pattern representing different channel forming processes. The channel is classified into 22 hierarchically organized types of pools, glides, riffles, rapids, steps, and cascades. The crews estimate the length and width of every habitat unit. At every unit, attributes are estimated or measured to describe gradient, substrate, woody debris, shade, features of instream cover, and bank stability. The habitat information is distributed along the length of the stream route in relation to the distance of the habitat unit from the start point of the stream.
MOST OF THIS INFORMATION WAS QUOTED VERBATIM FROM : Oregon Dept. of Fish & Wildlife Aquatic Inventories Project Habitat and Reach Data Coverages Metadata Date: August, 1997
1. Edit HUC cover routes to reflect the end point of the stream habitat survey. 2. Remeasure the route to the length (in meters) of the survey as determined by the survey crew and the analysis of the data. 3. Create a calibration coverage based on the HUC coverage. 4. Add calibration points which are identified as locations on each streams where we can be certain of the location of the crew. Points include bridge crossings, tributaries or reach changes. 5. Each calibration point is given a distance measure that corresponds to the distance from the start of the survey to that point on the stream. 6. Calibrate the routes on the huc coverage based on the calibration coverage. 7. Import the dbase file that contains the database information for the the reach or habitat datasets. 8. Create an eventsource with the dbase file. 9. Link the eventsource to the routed HUC cover based on the llid field. (The llid is the longitude and latitude of the starting arc of the stream. It was calculated and assigned using an aml by the ODFW GIS Division.) 10. Build the new coverage and create an export file.
Reviews Applied to Data: The data is reviewed before dissemination to the public. The dimensions of the arc attribute files are reviewed to assure that the necessary variables are present and have the correct field values. The reach and habitat datasets are reviewed in ArcView in order to determine that the dynamic segmentation and calibration process have placed certain landmarks in the correct location.
VEG_CLASS N, No Vegetation (bare soil, rock). B, SageBrush (sagebrush, greasewood, rabbitbrush, etc.).
G, Annual Grasses, herbs, and forbs. P, Perennial grasses, sedges and rushes. S, Shrubs (willow, salmonberry, some alder). D, Deciduous Dominated (canopy more than 70%alder, cottonwood, big >leaf maple, or other deciduous spp.). 50 distribution).
C, Coniferous Dominated (canopy more than 70%conifer).
1- 3, Seedlings and new plantings. 3-15, Young established trees or saplings. 15-30, Typical sizes for second growth stands. Westside communities may >have fully closed canopy at this stage.
30-50, Large trees in established stands. 50-90, Mature timber. Developing understory of treesand shrubs.
90+, Old growth. Very large trees, nearly alwaysconifers.
Plant community likely to include a combinationof big trees,
snags, down woody debris, and amulti-layered canopy.
LAND_USE AG, AGricultural crop or dairy land. TH, Timber Harvest. Active timber managementincluding tree felling,
logging, etc. Not yet replanted. YT, Young Forest Trees. Can range from recentlyplanted harvest units >to stands with trees up to 15 cm dbh.
ST, Second growth Timber. Trees 15-30 cm dbh ingenerally dense, >rapidly growing, uniform stands.).
LT, Large Timber (30-50 cm dbh). MT, Mature Timber (50-90 cm dbh). OG, Old Growth Forest. Many trees with 90+ cm dbhand plant community >with old growth characteristics.
PT, Partial cut Timber. Selection cut or shelterwoodcut with partial >removal of large trees. Combination of stumps and standing timber.
If only a few live trees orsnags in the unit, describe in note
column. FF, Forest Fire. Evidence of recent charring andtree mortality.
BK, Bug Kill. Eastside forests with > 60% mortalityfrom pests and >diseases. Enter bug kill as a comment on the unit sheet when it is
observed in small patches. LG, Light Grazing Pressure. Grasses, forbs andshrubs present, banks >not broken down, animal presence obvious only at limited points >such as water crossings. Cow pies present.
HG, Heavy Grazing Pressure. Broken banks, wellestablished cow paths.
Primarily bare earth or early successional stages ofgrasses and >forbs present.
EX, Exclosure. Fenced area that excludes cattlefrom a portion of range >land.
UR, URban. RR, Rural Residential. IN, INdustrial. MI, Mining. WL, WetLand. NU, No Use identified. COMM_CODE BC, Bridge Crossing. BD, Beaver Dam. BK, Bug Kill. Patches of insect or disease treemortality.
BV, BeaVer Activity (beaver den, cut trees, etc). CC, Culvert Crossing. CE, Culvert Entry. Tributary entering through culvert. CS, Channelized Streambanks. Rip-rap or otherartificial bank >stabilization and stream control.
DJ, Debris Jam. Accumulation of large woody debristhat fills the >stream channel and traps additional debris and sediment.
FC, Fence Crossing. GS, Gaging Station.gabion, log weir, >cabled or uncabled LWD, etc. in note.
SD, Screened Diversion (pump or canal SS, Spring or Seep. TJ, Tributary Junction with named and unnamedtributaries.
UD, Unscreened Diversion (pump or canal). WL, WildLife use of stream or riparian zone. TRASKHAB.AAT COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 4 12 F 3 21 TRASKHAB# 4 5 B - 25 TRASKHAB-ID 4 5 B - 29 BASIN 30 30 C - 59 STREAM 30 30 C - 89 SAMPL_DATE 8 10 D - 97 LOCATION 15 15 C - 112 REACH_NUMB 4 4 B - 116 REACH_NEW 4 4 B - 120 CHAN_FORM 2 2 C - 122 VALLEY_FM 2 2 C - 124 LAND_FM_LF 2 2 C - 126 LAND_FM_RT 2 2 C - 128 VEG_CLASS 15 15 C - 143 LAND_USE 5 5 C - 148 WATER_TEMP 4 4 F 1 152 UNIT_NUMB 4 7 B - 156 UNIT_TYPE 2 2 C - 158 UNIT_NAME 20 20 C - 178 CHANL_TYPE 2 2 C - 180 PER_FLOW 4 3 B - 184 COR_LENGTH 4 6 F 1 188 COR_WIDTH 4 4 F 1 192 COR_AREA 8 8 F 1 200 FROMDIST 8 10 F 1 208 TODIST 8 10 F 1 216 SLOPE 4 5 F 1 220 OPEN_SKY 4 4 F 1 224 AC_WIDTH 4 4 F 1 228 AC_HEIGHT 4 4 F 1 232 TERR_WIDTH 4 5 F 1 236 TERR_HEIGH 4 4 F 1 240 VWI 4 5 F 1 244 DEPTH 4 4 F 2 248 SO_ADJ 4 5 F 1 252 SND_ADJ 4 5 F 1 256 GRV_ADJ 4 5 F 1 260 CBL_ADJ 4 5 F 1 264 BLD_ADJ 4 5 F 1 268 BRK_ADJ 4 5 F 1 272 BLDR_COUNT 4 4 B - 276 BANK_CL_LF 2 2 C - 278 BANK_CL_RT 2 2 C - 280 UNDERCUT 4 3 B - 284 WOOD_CLASS 4 1 B - 288 NPIECES 4 5 B - 292 WVOLUME 8 10 F 2 300 KEYPIECES 4 3 B - 304 COMM_CODE 10 10 C - 314 NOTE_1 30 30 C - 344 NOTE_2 30 30 C - 374 CANOPY_CL 4 4 B - 378 SMALLCON 8 19 F 2 386 C_50 4 3 B - 390 C_90 4 3 B - 394 TOTHWOOD 8 19 F 2 402 LLID 13 13 C - 415 HABRCH 8 15 F 0 423 HABUNT 8 19 F 0 BASIN 'N FK. TRASK RIVER' 'S. FK TRASK RIVER' TRASK 'TRASK R.' 'TRASK RIVER' STREAM 'BALES CREEK' 'BARK SHANTY CREEK' 'BILL CREEK' 'BLUE BUS CREEK' 'BOUNDARY CREEK' 'CLEAR CREEK' 'CRUISER CREEK' 'EAST FK.OF S.FORK TRASK RIVER' 'EDWARDS CREEK' 'ELKHORN CREEK' 'GOLD CR.' 'HEADQUARTERS CAMP CREEK' 'JOYCE CREEK' 'LOWER TRASK RIVER' 'MIDDLE FK OF N.FK TRASK RIVER' 'MILLER CREEK' 'N. FORK OF N. FORK TRASK RIVER' 'NORTH FORK GOLD CREEK' 'NORTH FORK TRASK RIVER' 'PIGEON CREEK' 'ROCK CREEK' 'SCOTCH CREEK' 'SOUTH FORK TRASK RIVER' 'STEAMPOT CREEK' 'STRETCH CREEK'