Cumulative steelhead counts for the last 10 years

Bonneville Dam Run counted from July 1 to December 31.
Lower Granite Dam Run counted from July 1 to December 15 (Fall) and March 1 to June 30 (Spring).
Counts include wild and hatchery origin fish.

BONNEVILLE DAM		LOWER GRANITE DAM
Year	Total	Year	Fall	Spring	Total
2008	340,969	2008-2009	167,603	11,267	178,870
2007	310,276	2007-2008	146,230	7,878	154,108
2006	325,999	2006-2007	138,313	10,853	149,166
2005	302,437	2005-2006	147,506	7,678	155,184
2004	289,752	2004-2005	146,350	5,296	151,646
2003	346,951	2003-2004	164,471	8,039	172,510
2002	455,814	2002-2003	205,975	16,201	222,176
2001	605,681	2001-2002	255,723	12,743	268,466
2000	258,081	2000-2001	110,295	6,835	117,130
1999	198,543	1999-2000	70,101	2,754	72,855

Most of the steelhead that are bound for Idaho pass Bonneville Dam between July 1 and mid-October. Most of these fish pass Lower Granite Dam in the fall, however, some over-winter downstream of Lower Granite Dam and continue their migration to Idaho in the spring.