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Scientific Investigations Report 2009–5004

Hydrologic and Water-Quality Conditions During Restoration of the Wood River Wetland, Upper Klamath River Basin, Oregon, 2003–05

Table 11. Changes in peat thickness and nutrient content in soil cores collected from Wood River Wetland, upper Klamath River basin, Oregon.

[Data from Snyder and Morace (1997, p. 39) and D.T. Snyder (U.S. Geological Survey, unpub. data, 1997). Shading indicates cores closest to the ground-water piezometer nests. Initial: prior to the beginning of drainage of a wetland for agricultural use. 1995: quantity present in the year 1995, the year of core sample acquisition. Loss: the difference between initial and 1995. See Snyder and Morace (1997, p. 21–24) for method of calculation. Abbreviations: NU, North Unit; SU, South Unit; WRR, Wood River Ranch; ft, foot; kg, kilogram]

Wetland
unit
Core
name
Area of
wetland
represented
by core
(acres)
Peat thickness   Peat mass   Total organic carbon mass
Initial
(ft)
1995
(ft)
Loss
(ft)
Initial
(kg)
1995
(kg)
Loss
(kg)
Loss
(percent)
Initial
(kg)
1995
(kg)
Loss
(kg)
Loss
(percent)
North Unit WRR-05 343 4.3 3.5 0.8   220,000,000 210,000,000 12,000,000 5   84,000,000 70,000,000 14,000,000 17
WRR-07 223 0.7 0.3 0.4 25,000,000 23,000,000 2,000,000 8 8,300,000 4,000,000 4,200,000 51
WRR-08 491 11.3 7.3 4.0 900,000,000 730,000,000 170,000,000 19 290,000,000 100,000,000 190,000,000 65
  WRR-03 421 10.1 10.1 0   840,000,000 840,000,000 0 0   230,000,000 230,000,000 0 0
WRR-04 165 10.7 10.0 0.7 290,000,000 290,000,000 74,000,000 3 100,000,000 92,000,000 7,700,000 8
South Unit WRR-01 225 2.5 1.2 1.3   90,000,000 71,000,000 19,000,000 21   30,000,000 13,000,000 16,000,000 56
  WRR-02 187 7.0 3.7 3.3   210,000,000 180,000,000 34,000,000 16   69,000,000 32,000,000 37,000,000 53
WRR-10 390 8.5 5.5 3.0 500,000,000 430,000,000 74,000,000 15 160,000,000 90,000,000 70,000,000 44
WRR-09 225 14.5 10.1 4.4 520,000,000 480,000,000 36,000,000 7 160,000,000 110,000,000 53,000,000 33
Sum 2,670   3,600,000,000 3,200,000,000 360,000,000   1,100,000,000 750,000,000 390,000,000
Average 297 7.7 5.7 2.0 400,000,000 360,000,000 40,000,000 10 130,000,000 83,000,000 44,000,000 36
NU average 329 7.4 6.2 1.2 460,000,000 420,000,000 39,000,000 7 140,000,000 100,000,000 43,000,000 28
SU average 257 8.1 5.1 3.0 330,000,000 290,000,000 41,000,000 15 100,000,000 61,000,000 44,000,000 46

Wetland
unit
Core
name
Area of
wetland
represented
by core
(acres)
Total nitrogen mass   Total phosphorus mass
Initial
(kg)
1995
(kg)
Loss
(kg)
Loss
(percent)
Initial
(kg)
1995
(kg)
Loss
(kg)
Loss
(percent)
North Unit WRR-05 343 4,900,000 4,000,000 870,000 18   130,000 120,000 800 1
WRR-07 223 590,000 390,000 200,000 34 17,000 17,000 0 0
WRR-08 491 21,000,000 10,000,000 10,000,000 50 550,000 280,000 270,000 49
  WRR-03 421 19,000,000 19,000,000 0 0   350,000 350,000 0 0
WRR-04 165 4,900,000 4,400,000 500,000 10 140,000 120,000 13,000 10
South Unit WRR-01 225 2,100,000 1,000,000 1,100,000 51   56,000 54,000 1,500 3
  WRR-02 187 4,900,000 2,700,000 2,200,000 45   130,000 81,000 53,000 39
WRR-10 390 12,000,000 6,800,000 4,800,000 42 250,000 180,000 76,000 30
WRR-09 225 11,000,000 7,900,000 3,400,000 30 270,000 190,000 73,000 28
Sum 2,670 79,000,000 56,000,000 23,000,000 1,900,000 1,400,000 480,000
Average 297 8,800,000 6,200,000 2,600,000 31 210,000 160,000 54,000 18
NU average 329 9,900,000 7,500,000 2,400,000 23 230,000 180,000 56,000 12
SU average 257 7,500,000 4,600,000 2,900,000 42 180,000 130,000 51,000 25

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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