Henrys Lake
Henrys Lake is managed by Idaho Fish and Game. Lake Insights displays its latest available elevation from U.S. Geological Survey (USGS).
Lake Status
- 7-day trend
- Stable
- 7-day change
- Down 0.05 ft
- 30-day change
- Down 0.05 ft
- Last updated
- 1 hour ago
Watershed drought conditions
Fremont County, ID · surrounding county from lake location
Extreme Drought
Extreme drought conditions are present.
Severity
Weekly trend
Stable
Compared with last week
Official drought
Yes
100% of the watershed is currently classified as official drought (D1+).
Expected impacts
- Significantly reduced stream inflows
- Lake levels may fall quickly without heavy rain
- Dry vegetation and elevated wildfire risk
- Water use restrictions may apply nearby
U.S. Drought Monitor · map date Sep 8, 2026. Updated weekly. droughtmonitor.unl.eduView drought map for Fremont County, ID
Key Facts
Managing authority
Waterbody / project type
Current-level source
Why the level can change
General factors for reservoirs like this
These are common influences for this type of lake. They do not identify the cause of a specific current change unless an operator update confirms it.
Rainfall & inflows
Rain and upstream river inflows can raise reservoir levels, especially after storms.
Downstream releases
When an operator releases water through a dam, reservoir storage can fall and downstream flows can rise.
Flood-risk operations
Some projects store or release water under flood-risk rules when conditions require it.
Water supply
Some reservoirs support municipal, industrial, irrigation, or regional water-supply needs.
Hydropower
Hydropower projects may pass water through turbines when generating electricity.
Seasonal weather
Dry periods, heat, evaporation, and seasonal rainfall patterns can affect storage over weeks and months.
Current data source
Managing authority: Idaho Fish and Game
Observation source used by Lake Insights: U.S. Geological Survey (USGS)
Who manages the lake and who publishes the reading Lake Insights displays can differ. Lake Insights does not invent a source label from the managing authority alone.
General education
Shared background — not lake-specific facts
Lake Insights aggregates water level information from authoritative public sources such as the U.S. Army Corps of Engineers, NOAA, TVA, Bureau of Reclamation, power utilities, and other official lake operators. We preserve historical observations, calculate trends, and present lake conditions in a consistent format. For U.S. Geological Survey (USGS), we link to the official source whenever it is available. Lake Insights does not predict future lake levels unless an official forecast has been published by the managing authority.
Common questions about Henrys Lake
- Who manages Henrys Lake?
- Henrys Lake is managed by Idaho Fish and Game. Lake Insights reports published gauge readings; it does not operate the waterbody.
- Where does Lake Insights get the level reading for Henrys Lake?
- Lake Insights displays the latest available elevation for Henrys Lake from U.S. Geological Survey (USGS). The managing authority (Idaho Fish and Game) may differ from the agency that publishes the observation used on this page.