Keyhole Reservoir

Last updated: Aug 7, 2025, 4:57 AM UTC
No watches, warnings or advisories are in effect for this area.

Flood Impacts 🅘

  • 4134 - Dam crest elevation.
  • 4128.7 - Normal water surface elevation.
  • 4111.5 - Top of flood control.

Gauge Info

Coordinates 44.3819, -104.779
RFC MBRFC
State WY
WFO UNR
County Crook
Data Provider(s)
US Bureau of Reclamation Bureau of Reclamation Keyhole Reservoir
U.S. Army Corps of Engineers U.S. Army Corps of Engineers Website

Gauge Location

Recent Crests

1. 4092.67 ft on 05-21-2024
2. 4092.90 ft on 06-14-2022
3. 4095.35 ft on 10-04-2020
4. 4099.58 ft on 03-14-2020
5. 4101.98 ft on 03-28-2019

Historic Crests

1. 4101.98 ft on 03-28-2019
2. 4100.38 ft on 05-21-1978
3. 4099.58 ft on 03-14-2020
4. 4099.55 ft on 06-27-2015
5. 4099.45 ft on 03-17-2012

Vertical Datum Table

type NGVD29
major Flooding N/A
moderate Flooding N/A
minor Flooding N/A
action 8115.30 ft
Latest Value 8106.04 ft
Gauge Zero 4016.00 ft

Gauge Photos

Photo 1 of 3

Keyhole Dam

Probability Information

Photo 1 of 2

Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

WFO Information

Weather Forecast Office
Rapid City
300 East Signal Drive
Rapid City, SD 57701-3800
Official Homepage