Table 8. Survey data for mined sites on the South Umpqua River, Oregon, 2001–2009.

[Survey data provided by the gravel operators. At most sites, surveys from 2001–04 provide raw cut and fill volumes, but for 2005–09, only the net volumes were provided. Survey volumes were converted to mass using a bulk density of 2. Abbreviation: FPKM, flood-plain kilometer; –, no data; na, not applicable]

Operator	Survey date	Bar process recorded in survey	Raw survey data			Net deposition, extraction, and erosion volumes			Notes
			Surveyed raw cut mass (metric tons)	Surveyed raw fill mass (metric tons)		Deposition mass (metric tons)	Extracted (mined) mass (metric tons)	Erosion mass (metric tons)
Umpqua Sand and Gravel Bar, FPKM 171.4
Umpqua Sand and Gravel1	09-00	–	–	na		na	na
	06-01	Erosion	-11,510	550		-10,960
	08-01	Extraction	-10,390	1,120		na	-9,260	na
	08-02	Deposition	-1,220	3,220		2,000	na	na
	08-03	Deposition	-1,580	42290		2,710	na	na
	10-03	Extraction	-1,550	940		na	-610
	07-04	Deposition	–	–		1,790	na		Bulk of deposit near one transect (L3)
	09-04	Extraction	–	–		na	-1,910	na	Most of material mined between two transects (L3 and L4)
	05-06	Deposition	–	–		15,920	na	na	Bar migrated upstream; decreased length, increased width and elevation (~0.3–0.6 m)
	07-07	Deposition	–	–		1,650	na	na	Minor increase in bar elevation (~0.3 m)
	06-08	Deposition	–	–		3,110	na	na	Minor increase in bar elevation (~0.3 m), more defined side channel developed
	10-09	Erosion	–	–		na	na	-1,580	Most erosion on downstream one-third to one-half bar
Shady Bar, FPKM 186.2
Knife River Corporation2	07-01	Deposition	-1,400	9,590	8,180	na	na	Fill quantities almost entirely from additional gravel in stock piles
	07-02	Erosion	-3,750	1,260	na	na	-2,490
	07-03	Deposition	-2,030	7,370	5,340	na	na
	08-04	Deposition	–	–	10,420	na	na	Mining across and along bar
	07-05	Erosion	–	–	na	na	-2,770
	05-06	Deposition	–	–	30,600	na	na	Uniform increase in bar elevation (~0.3–0.6 m) measured at each transect
	06-07	Deposition	–	–	9,750	na	na	Indiscernible difference for transects between surveys
	06-2008	Deposition	–	–	2,810	na	na	Indiscernible difference for transects between surveys
Little Valley Bar, FPKM 189.7
Knife River Corporation2	09-02	–	–	na	na	na
	07-03	Deposition	-2,310	7,600	5,290	na	na
	07-04	Deposition	-470	3,600	3,130	na	na
	07-05	Deposition	–	–	2,610	na	na
	05-06	Deposition	–	–	9,200	na	na	Increase in bar elevation (~1 to 4 feet)
	07-07	Deposition	–	–	3,110	na	na	Increased elevation upstream, decreased elevation downstream
	06-08	Deposition	–	–	1,680	na	na
	09-09	Deposition	–	–	1,250	na	na
Weigle Bar, FPKM 211
Knife River Corporation2	07-02	–	–	na	na	na
	07-03	Deposition	-740	2,300	1,570	na	na
	07-04	Erosion	-1,140	790	na	na	-350
	09-04	Extraction	–	–	na	-13,160	na	Increase in bar elevation (~2 to 5 feet)
	07-05	Deposition	–	–	2,450	na	na
	05-06	Deposition	–	–	8,370	na	na
	06-07	Erosion	–	–	na	na	-1,870
	06-08	Deposition	–	–	170	na	na
	09-09	Deposition	–	–	480	na	na
Gazley East Bar, FPKM 232
Knife River Corporation2	07-02	–	–	na	na	na
	07-03	Deposition	-2,420	3,950	1,530	na	na
	08-04	Deposition	–	–	4,500	na	na
	07-05	Erosion	–	–	na	na	-9,240
	06-06	Deposition	–	–	20,810	na	na	Increase in bar elevation (~0.5–2 feet)
	06-07	Erosion	–	–	na	na	-1,930
	06-08	Deposition	–	–	1,300	na	na
	09-09	Deposition	–	–	1,590	na	na
Days Creek Bar, FPKM 249.9
Knife River Corporation2	07-02	–	–	na	na	na
	07-03	Erosion	-4,880	3,230	-1,660
	07-04	Deposition	-4,810	5,940	1,140	na	na
	09-04	Extraction	–	–	na	-21,500	na	Most of material mined between two transects (7+48.33 and 8+86)
	08-05	Deposition	–	–	80	na	na
	05-06	Deposition	–	–	9,210	na	na	Previously extraction zones filled with deposition material
	06-07	Erosion	–	–	na	na	-2,800
	06-08	Deposition	–	–	6,630	na	na	Water flow in extraction zone
	09-09	Deposition	–	–	1,940	na	na
Gazley West Bar, FPKM 231
Knife River Corporation	09-09	Deposition	–	–	na	na	na

¹ Survey data provided by Joy Smith, Umpqua Sand and Gravel, written commun., 2008–10.

² Survey data provided by Mike Flewelling, Knife River Corporation, written commun., 2008–10 and IE Engineering, written commun., 2008 and 2009.

First posted September 29, 2011