Table 12. Project summary data for passable mainstem dams on the Columbia and Snake rivers. (USDOE et. al 1994).
Dam (Powerhouse)	Year Complete	Full Pool (ft)	Minimum Operating Pool (ft)	# Turbine Units	# Units with Screens	MW Cap.	Pool Length (mi)
Bonneville (1)	1938	77	70	10	10	518	46
Bonneville (2)	1982			8	8	532
The Dalles	1960	160	155	14 (1960) 8 (1973)	0	1,780	24
John Day	1971	268	257	16	16	2,160	76
McNary	1957	340	335	14	14	980	61
Ice Harbor	1962	440	437	3 (1962) 3 (1975)	6	603	32
Lower Monumental	1970						29
Little Goose	1970	638	633	3 (1970) 3 (1978)	6	810	37
Lower Granite	1975	738	733	3 (1975) 3 (1978)	6	810	5
Priest Rapids	1959	83	18				18
Wanapum	1963	84	38				38
Rock Island	1933	54	21				21
Rocky Reach	1961	93	42				42
Wells	1967	72	29				29