| Sentinel Island | |
| Pushpin Map: | USA Colorado#USA |
| Coordinates: | 39.5997°N -106.0659°W |
| Location: | Colorado |
| Area Sqft: | or |
| Area Acre: | --> |
| Length Ft: | --> |
| Width Ft: | --> |
| Coastline Ft: | --> |
| Country: | United States |
| Country Admin Divisions Title: | State |
| Country Admin Divisions Title 1: | County |
| Country Admin Divisions 1: | Summit County |
Sentinel Island is a small island in Summit County, Colorado in the Dillon Reservoir. It appears on a 1970 USGS map of the area, along with Silver Dollar Island and Fishhook Island.[1]