USGS WRIR 00-4001 Table 4

WRIR 00-4001
Surface- and Ground Water Characteristics in the Upper Truckee River and Trout Creek Watersheds

**Table 4.** Streamflow measurement data and seepage estimates for designated main-stem reaches in the Upper Truckee River and Trout Creek, California, September 1996

[Abbreviations and symbol: ft³/s, cubic feet per second; ft³/s/mi, cubic feet per second per mile; nd, streamflow not determined; --, not applicable]
Reach number (pl. 1)	Reach segment (between site numbers)	Flow at beginning of reach (ft³/s)	Tributary flows (ft³/s)	Flow out of reach (ft³/s)	Percent change in flow¹	Estimated ground-water seepage (ft³/s)²	Reach designation³	Estimated gain (+) or loss (-) per unit length (ft³/s/mi)⁴
Upper Truckee River
1	1 to 3	11.6	0	nd	--	--	--	--
2	3 to 6	11.2	0	11.6	+3.6	--	Steady	--
3	6 to 7	10.1	0	11.2	+11	+1.1	Gaining	+1.2
4	7 to 9	10.3	0	10.1	-1.9	--	Steady	--
5	9 to 15	10.4	.8	10.3	-8.0	-0.9	Losing	-0.50
6	15 to 17	8.5	.1	10.4	+21	+1.8	Gaining	+1.2
7	17 to 20	7.7	.1	8.5	+9.0	+0.7	Gaining	+1.4
8	20 to 25	6.4	0	7.7	+20	+1.3	Gaining	+0.52
9	25 to 43	3.1	2.9	6.4	+6.7	+0.4	Gaining	+0.27
10	43 to 45	2.6	.6	3.1	-3.1	--	Steady	--
Trout Creek
11	46 to 49	22.6	0	23.0	+1.8	--	Steady	--
12	49 to 52	20.6	.2	22.6	+8.7	+1.8	Gaining	+1.4
13	52 to 57	10.8	11.2	20.6	-6.4	-1.4	Losing	-0.93
14	57 to 65	9.8	2.6	10.8	-13	-1.6	Losing	-0.67
15	65 to 68	6.2	2.2	9.8	+17	+1.4	Gaining	+0.67
16	68 to 70	4.7	1.0	6.2	+8.8	+0.5	Gaining	+0.62

Table 4. Streamflow measurement data and seepage estimates for designated main-stem reaches in the Upper Truckee River and Trout Creek, California, September 1996

[Abbreviations and symbol: ft³/s, cubic feet per second; ft³/s/mi, cubic feet per second per mile; nd, streamflow not determined; --, not applicable]

Reach
number
(pl. 1)

Reach
segment
(between
site numbers)

Flow at
beginning
of reach
(ft³/s)

Tributary
flows
(ft³/s)

Flow out
of reach
(ft³/s)

Percent
change
in flow¹

Estimated
ground-water
seepage
(ft³/s)²

Reach
designation³

Estimated gain (+) or loss (-) per
unit length
(ft³/s/mi)⁴

Upper Truckee River

1 to 3

11.6

3 to 6

11.2

11.6

+3.6

Steady

6 to 7

10.1

11.2

+11

+1.1

Gaining

+1.2

7 to 9

10.3

10.1

-1.9

Steady

9 to 15

10.4

10.3

-8.0

-0.9

Losing

-0.50

15 to 17

8.5

10.4

+21

+1.8

Gaining

+1.2

17 to 20

7.7

8.5

+9.0

+0.7

Gaining

+1.4

20 to 25

6.4

7.7

+20

+1.3

Gaining

+0.52

25 to 43

3.1

2.9

6.4

+6.7

+0.4

Gaining

+0.27

43 to 45

2.6

3.1

-3.1

Steady

Trout Creek

46 to 49

22.6

23.0

+1.8

Steady

49 to 52

20.6

22.6

+8.7

+1.8

Gaining

+1.4

52 to 57

10.8

11.2

20.6

-6.4

-1.4

Losing

-0.93

57 to 65

9.8

2.6

10.8

-13

-1.6

Losing

-0.67

65 to 68

6.2

2.2

9.8

+17

+1.4

Gaining

+0.67

68 to 70

4.7

1.0

6.2

+8.8

+0.5

Gaining

+0.62

^1.Percent change in flow determined as difference between flow out of reach and sum of flow at beginning of reach and all tributary flows.

^2.Ground-water seepage is difference between flow out of reach and sum of flow at beginning of reach and all tributary flows.

^3.If percent change in flow is greater than 5 percent, then reach is designated as gaining (gaining flow from ground-water seepage into reach). If percent change in flow is less than -5 percent, then reach is designated as losing (losing flow to ground-water seepage out of reach). If percent change in flow is greater than -5 percent and less than 5 percent, then reach is designated as steady (no change in flow due to ground-water seepage).

^4. Gain (+) or loss (-) is estimated ground-water seepage divided by length of reach (see table 2 for river mile designations).