Sentinel Island (Colorado)

Sentinel Island
	Aerial photo of Sentinel Island, September 2024
	Sentinel Island Sentinel Island
Geography
Location	Colorado
Coordinates	39°35′59″N106°03′57″W / 39.5997087°N 106.0658527°W
Administration
	United States
State	Colorado
County	Summit County

Last updated October 04, 2025

Sentinel Island is a small island in Summit County, Colorado in the Dillon Reservoir.^[1] It appears on a 1970 USGS map of the area, along with Silver Dollar Island and Fishhook Island.^[2]

References

1 2 U.S. Geological Survey Geographic Names Information System: Sentinel Island
↑ United States Geological Survey (1970). "Frisco Quadrangle, Colorado" (Map). United States Department of the Interior Geological Survey. 1:62500.

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[gnis-1] 1 2 U.S. Geological Survey Geographic Names Information System: Sentinel Island

[quad-2] United States Geological Survey (1970). "Frisco Quadrangle, Colorado" (Map). United States Department of the Interior Geological Survey. 1:62500.

[1]

[2]

Geography
Aerial photo of Sentinel Island, September 2024
Sentinel Island Show map of Colorado Sentinel Island Show map of the United States
Location	Colorado
Coordinates	39°35′59″N106°03′57″W / 39.5997087°N 106.0658527°W / 39.5997087; -106.0658527 (Sentinel Island) ^[1]
Administration
United States
State	Colorado
County	Summit County