Glacial Lake Iroquois
Glacial Lake Iroquois was a prehistoric proglacial lake that existed at the end of the last ice age approximately 13,000 years ago.
The lake was essentially an enlargement of the present Lake Ontario that formed because the St. Lawrence River downstream from the lake was blocked by the ice sheet near the present Thousand Islands. The level of the lake was approximately 30 m (~100 ft) above the present level of Lake Ontario.
The lake drained to the southeast, through a channel passing near present day Rome, New York. The Rome Sand Plains has several sand ridges that geologists think were formed at this time. The channel then followed the valley of the Mohawk River to the Hudson River.

The lake was fed by Early Lake Erie, as well as Glacial Lake Algonquin, an early partial manifestation of Lake Huron, that drained directly to Lake Iroquois across southern Ontario, along the southern edge of the ice sheet, bypassing Early Lake Erie.

The subsequent melting of the ice dam resulted in a sudden lowering of the lake to its present level, a potential trigger for the Younger Dryas episode.
Q1320719
proglacial lake
LOC
Q49367
ice age
Concept
Q1062
Lake Ontario
LOC
Q134750
St. Lawrence River
LOC
Q1050549
Thousand Islands
LOC
Q6586
Rome, New York
LOC
Q7363006
Rome Sand Plains
LOC
Q1345896
Mohawk River
LOC
Q3140
Hudson River
LOC
Q5326680
Early Lake Erie
LOC
Q6474720
Glacial Lake Algonquin
LOC
Q1383
Lake Huron
LOC
Q1904
Ontario
LOC
Q1320719
ice dam
LOC
Q944279
Younger Dryas
TIME
Q3215744
Glacial Lake Iroquois
LOC
+30^^http://www.w3.org/2001/XMLSchema#decimal
30
NUMBER
+100^^http://www.w3.org/2001/XMLSchema#decimal
100
NUMBER
located in the administrative territorial entity
lake outflow
mouth of the watercourse
located in the administrative territorial entity