Jackson Lake
Jackson Lake is managed by U.S. Bureau of Reclamation / Grand Teton National Park. Lake Insights displays its latest available elevation from USACE NWW District. Published reference elevations are listed below.
Lake Status
22.24 feet below full pool
−22.24 ft vs full pool
- 7-day trend
- Falling
- 7-day change
- Down 1.98 ft
- 30-day change
- Down 1.98 ft
- Last updated
- Today
Jackson Lake is currently 22.24 feet below full pool and has been falling over the past week. Readings show continued drawdown relative to full pool, with levels trending lower over the past week.
Watershed drought conditions
Teton County, WY · surrounding county from lake location
Moderate Drought
Moderate drought is affecting the watershed.
Severity
Weekly trend
Stable
Compared with last week
Official drought
Yes
100% of the watershed is currently classified as official drought (D1+).
Expected impacts
- Stream inflows may run below normal
- Lake levels can decline faster between rain events
- Vegetation stress may increase over time
U.S. Drought Monitor · map date Sep 8, 2026. Updated weekly. droughtmonitor.unl.eduView drought map for Teton County, WY
Key Facts
Managing authority
Waterbody / project type
Official purposes
Full pool
Datum
Current-level source
Project / NID identifier
Dam / watershed (NID design values)
Static design values from a confidently matched National Inventory of Dams record — not live gage readings.
- Normal storage
- 847,000 acre-ft
- Max storage
- 872,700 acre-ft
- Surface area at normal pool
- 25,540 acres
- Drainage area
- 806 sq mi
- Spillway capacity (design)
- 8,690 cfs
- Dam structure
- Concrete · 84 ft high · completed 1911
- Hazard classification
- High
- Safety & inspection
- last inspection Jul 13, 2022
National Inventory of Dams · matched record: Jackson Lake Dam (WY01385)
How this lake is operated
- Documented project purposes (National Inventory of Dams): Flood Risk Reduction, Fish and Wildlife Pond, Irrigation, Recreation.
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.
Published reference elevations
- Full pool
- 6759.00 ft
Published reference elevation. Not necessarily a fixed year-round target for every project.
Current data source
Managing authority: U.S. Bureau of Reclamation / Grand Teton National Park
Observation source used by Lake Insights: USACE NWW District
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 USACE NWW District, 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 Jackson Lake
- Who manages Jackson Lake?
- Jackson Lake is managed by U.S. Bureau of Reclamation / Grand Teton National Park. Lake Insights reports published gauge readings; it does not operate the waterbody.
- What is full pool at Jackson Lake?
- The published full-pool elevation for Jackson Lake is 6759.00 ft (NGVD29). Full pool is a published reference elevation — not a prediction of today’s level.
- Where does Lake Insights get the level reading for Jackson Lake?
- Lake Insights displays the latest available elevation for Jackson Lake from USACE NWW District. The managing authority (U.S. Bureau of Reclamation / Grand Teton National Park) may differ from the agency that publishes the observation used on this page.
- What datum is used for Jackson Lake?
- Elevations for Jackson Lake are referenced to NGVD29 (MSL).
- What are the documented purposes of Jackson Lake?
- Documented purposes for Jackson Lake (National Inventory of Dams): Flood Risk Reduction, Fish and Wildlife Pond, Irrigation, Recreation.