| Gilhooley Tower | |
| Elevation Ft: | 7480. |
| Prominence Ft: | 120. |
| Isolation Mi: | 0.25 |
| Isolation Ref: | [1] |
| Parent Peak: | Mount Deception |
| Map: | Washington#USA |
| Label Position: | bottom |
| Part Type: | Protected area |
| Part: | Olympic National Park |
| Country: | United States |
| State: | Washington |
| Region: | Jefferson |
| Region Type: | County |
| Coordinates: | 47.8161°N -123.2372°W |
| Topo: | USGS Mount Deception |
| Range: | Olympic Mountains |
| Rock: | Basalt |
| Age: | Eocene |
| First Ascent: | 1963 by Donald Anderson, Harold Pinsch, Joyce Pinsch[2] |
Gilhooley Tower is a basalt spire in the Olympic Mountains and is located in Jefferson County of Washington state. It is situated in Olympic National Park on the Olympic Peninsula. Its nearest higher peak is Mount Deception at 0.13miles to the southeast. Precipitation runoff drains into tributaries of the Dungeness River and Dosewallips River.
Based on the Köppen climate classification, Gilhooley Tower is located in the marine west coast climate zone of western North America.[3] Weather fronts originating in the Pacific Ocean travel northeast toward the Olympic Mountains. As fronts approach, they are forced upward by the peaks (orographic lift), causing them to drop their moisture in the form of rain or snow. As a result, the Olympics experience high precipitation, especially during the winter months in the form of snowfall.[4] Because of maritime influence, snow tends to be wet and heavy, resulting in avalanche danger. During winter months weather is usually cloudy, but due to high pressure systems over the Pacific Ocean that intensify during summer months, there is often little or no cloud cover during the summer.[4]