Table 1. Sample sites

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Table 1. Number of random sites sampled for aquatic vegetation by study reach and aquatic strata. A dash (–) indicates the stratum was not sampled.

Study reach	Year	Contiguous backwater, upper	Contiguous backwater, lower	Isolated backwater	Lake Pepin, upper	Lake Pepin, lower	Main channel border, upper
Pool 4	1998	74	157	31	57	29	9
	1999	75	160	34	65	35	12
	2000	100	179	32	75	75	30
	2001	100	176	50	75	75	30
	2002	100	180	30	75	75	30
	2003^a	92	165	–	–	–	26
	2004	102	181	32	77	77	31
	2005	90	108	20	59	50	20
	2006	90	110	11	60	50	20
^aData were provided by the U.S. Fish and Wildlife Service and the Division of Fisheries, Minnesota Department of Natural Resources.

Study reach	Year	Main channel border, lower	Secondary channel, upper	Secondary channel, lower	Total Pool 4, upper	Total Pool 4, lower	Total Pool 4
Pool 4	1998	37	47	65	187	288	506
	1999	48	61	59	213	302	549
	2000	40	40	60	245	354	631
	2001	40	40	60	245	351	646
	2002	40	40	60	245	355	630
	2003^a	23	39	53	157	241	398
	2004	41	41	61	251	360	643
	2005	30	30	39	199	227	446
	2006	30	30	40	200	230	441
^aData were provided by the U.S. Fish and Wildlife Service and the Division of Fisheries, Minnesota Department of Natural Resources.

Study reach	Year	Contiguous backwater	Isolated backwater	Impounded	Main channel border	Secondary channel	Total
Pool 8	1998	172	28	170	53	93	516
	1999	172	28	225	70	100	595
	2000	175	30	225	99	120	649
	2001	175	50	225	100	120	670
	2002	174	26	224	100	120	644
	2003	174	30	225	100	120	649
	2004	175	29	225	100	120	649
	2005	110	20	185	70	65	450
	2006	108	16	185	70	65	444

Study reach	Year	Contiguous backwater	Isolated backwater	Impounded	Main channel border	Secondary channel	Total
Pool 13	1998	170	28	209	62	62	531
	1999	170	30	210	70	70	550
	2000	198	30	210	70	70	578
	2001	198	59	209	70	70	606
	2002	200	30	209	70	70	579
	2003	200	30	210	70	70	580
	2004	220	34	236	79	79	648
	2005	120	25	175	80	50	450
	2006	120	25	175	80	50	450

Study reach	Year	Contiguous backwater	Isolated backwater, Illinois River	Isolated backwater, Mississippi River	Impounded	Main channel border, Illinois River
Pool 26	1998	50	160	30	27	47
	1999	80	160	50	80	50
	2000	79	95	42	39	40
	2001	80	94	60	40	40
	2002	80	100	57	40	40
	2003^a	80	100	60	40	40
	2004	110	132	58	56	56
^aData were provided by the Illinois Natural History Survey based on a grant from the National Great Rivers Research and Education Center.

Study reach	Year	Main channel border, Mississippi River	Secondary channel	Total Pool 26, Mississippi River	Total lower Alton Pool, Illinois River	Total Pool 26 and Alton Pool combined
Pool 26	1998	121	84	312	207	519
	1999	137	90	437	210	647
	2000	47	50	257	135	392
	2001	49	50	279	134	413
	2002	50	50	277	140	417
	2003^a	50	50	280	140	420
	2004	69	69	362	188	550
^aData were provided by the Illinois Natural History Survey based on a grant from the National Great Rivers Research and Education Center.

Study reach	Year	Contiguous backwater	Isolated backwater	Lakes^a	Main channel border	Secondary channel	Total
La Grange Pool	1998	173	179	–	83	29	464
	1999	190	188	–	120	40	538
	2000	100	138	57	80	50	425
	2001	100	129	57	78	50	414
	2002	100	139	59	80	50	428
	2003^a	100	117	60	80	50	407
	2004	128	175	74	103	65	545
^aThe lakes stratum was added to the sampling in 2000. ^bData were provided by the Illinois Natural History Survey based on a grant from the Illinois Department of Natural Resources.

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