Lake levels
Mackay Reservoir, ID
- gauge height
- 19.25 ft
- Condition
- Falling
- 7-day change
- -1.67 ft
- 30-day change
- -8.47 ft
- Since yesterday
- -0.07 ft
Reading as of 2026-10-13 | the U.S. Geological Survey
- Since yesterday
- -0.07 ft
- 7-day change
- -1.67 ft
- 30-day change
- -8.47 ft
- Average
- 47.50 ft
In brief
Mackay Reservoir's gauge read 19.25 feet on Oct 13, 2026.
Source: U.S. Geological Survey
Gauge height above a local reference point; not elevation above sea level.
Last 30 days
Last 176 days
Level and data on file
| Current level | 19.25 ft |
|---|---|
| Data span | 176 days, since 2026-04-21 (176 readings) |
Level schematic
Trout stocking on Mackay Reservoir
IDFG stocked Mackay Reservoir 9 times in 2026, 182,591 fish in total. Rainbow Trout and Rainbow Trout - Triploid at Adults and Fingerling (3-6 inches). IDFG's published figures for 2026, the most recent season it has confirmed, record 182,591 trout actually released here across 9 visits.
| Species | Fish | When |
|---|---|---|
| Rainbow Trout | 62 | January 2026 |
| Rainbow Trout | 460 | January 2026 |
| Rainbow Trout | 272 | January 2026 |
| Rainbow Trout | 168,042 | May 2026 |
| Rainbow Trout - Triploid | 2,067 | May 2026 |
| Rainbow Trout | 4,218 | May 2026 |
| Rainbow Trout | 4,195 | May 2026 |
| Rainbow Trout | 1,200 | May 2026 |
| Rainbow Trout - Triploid | 2,075 | June 2026 |
IDFG lists a week or a month rather than a date, and counts fish as an estimate. Full Idaho stocking schedule →
Frequently asked questions
Is Mackay Reservoir full right now?
As of 2026-10-13, Mackay Reservoir sits at 19.25 ft. Over the past 30 days the level has fallen 8.47 ft.
What is the water level at Mackay Reservoir today?
The most recent reading at Mackay Reservoir is 19.25 ft (2026-10-13), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
How much has Mackay Reservoir moved recently?
Readings for Mackay Reservoir run from 19.25 ft to 61.55 ft over the 176 days on file, which begin 2026-04-21. That window is shorter than a year, so neither end is a record for the lake. A lake's range includes a full seasonal cycle, and this gauge has not yet published one.
Why is Mackay Reservoir low right now?
Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Mackay Reservoir has fallen 8.47 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Mackay Reservoir changed over the past year?
Year-over-year comparison is not available for Mackay Reservoir yet. The published series on this page covers 176 days, from 19.25 ft to 61.55 ft. That is not long enough to describe the lake's historical range.
Download and cite
Quote this reading
Mackay Reservoir's gauge read 19.25 feet on Oct 13, 2026.
Download the full record
mackay-reservoir-id-water-level-history.csv
How to cite
MyWaterLevel, “Mackay Reservoir water level, 2026,” data from U.S. Geological Survey, https://mywaterlevel.com/lake/id/mackay-reservoir/, accessed Oct 13, 2026.
Source: the U.S. Geological Survey. All Idaho lake levels. Readings are provisional and may be revised. About our data and methods.