Juvenile salmonid migratory behavior at the mouth of the Columbia River and within the plume

Table 2 Summary of travel rate (rkm/day) data for emigrating yearling Chinook salmon, steelhead, and subyearling Chinook salmon by season

Species/stock	Season	N	Travel rate (rkm/day)					Mean estimated remaining tag life (days)
Species/stock	Season	N	Mean	SD	Minimum	Maximum	Median
CH1	Early	330	56.7	47.8	0.7	220.1	47.7	18.9
	Late	255	60.1	52.7	0.5	244.9	48.6	19.8
	Total	585	58.2	50.0	0.5	244.9	47.7	19.3
STH	Early	70	103.7	48.3	1.4	195.6	113.9	18.3
	Late	112	88.1	63.8	3.3	252.4	75.8	19.3
	Total	182	94.1	58.7	1.4	252.4	94.8	18.9
CH0	Total	811	30.9	31.0	0.6	224.6	21.3	22.1
All species		1,578	48.3	47.4	0.5	252.4	32.4	20.7

Early season detections include 5 to 18 May 2010 and late season detections include 19 May to 7 June 2010 for yearling Chinook salmon and steelhead. Travel rate was calculated from the last detection at the mouth of the Columbia River (rkm 8.3, 4.5, 2.8) to the first detection on the plume array. CH1, yearling Chinook salmon; STH, steelhead; CH0, subyearling Chinook salmon.