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SwedenBig Lost River below Mackay Reservoir near Mackay water level
River gauge, Big Lost River, Idaho, United States
Right now
Below flood stage
Water level
- Flow
- 74.7 cfs
History
The forecast expects the river to fall to 1.60 ft by Tuesday, October 20 at 12:00 PM. Issued Tuesday, October 20 at 09:20 AM by NOAA National Weather Service.
What this means
Water levels are unremarkable at Big Lost River below Mackay Reservoir near Mackay, where the gauge shows 1.60 ft.
It is 2.70 ft below the flood stage of 4.30 ft.
The level has held steady over the past 24 hours. The forecast expects the river to fall to 1.60 ft by Tuesday, October 20 at 12:00 PM. The 30-day range is 1.60 ft – 1.99 ft.
Judged against the official flood stage for this gauge. How to read levels
Key numbers
- Highest on record
- 6.08 ftJune 6, 1986
- Forecast peak
- 1.60 ftTuesday, October 20 at 12:00 PM
Paddling and fishing conditions
Most paddlers and anglers will find the river in good shape at this stage.
For reference, flood stage is 4.30 ft.
What happens at each level
- 4.30 ft
- Lowland flooding below Mackay Dam through the Darlington Flats. US Highway 93 may be impacted at the curve by Leslie between 3900 North and 4050 North.
- 3.80 ft
- Near bankfull from Mackay Dam through the Darlington Flats. Water is likely to start to seep in low-lying areas in the Darlington Flats.
- 1.60 ft
- Right now
Impact statements from the U.S. National Weather Service.
Highest crests on record
| Rank | Level | Date |
|---|---|---|
| 1 | 6.08 ft | June 6, 1986 |
| 2 | 5.93 ft | June 17, 1974 |
| 3 | 5.89 ft | June 14, 1965 |
| 4 | 5.79 ft | June 10, 1921 |
| 5 | 5.65 ft | May 26, 1958 |
| 6 | 5.65 ft | June 30, 1982 |
| 7 | 5.52 ft | June 9, 2006 |
| 8 | 5.09 ft | June 10, 2017 |
| 9 | 4.95 ft | May 27, 2018 |
| 10 | 4.77 ft | June 30, 2011 |
Weather at the gauge
No rain in the last 3 days.
Forecast: Open-Meteo
Map
Other gauges on the Big Lost River
| Gauge | Level | Compared with normal | 24 hours | Distance |
|---|---|---|---|---|
| Big Lost River at Howell Ranch near ChillyRiver gauge, Big Lost River | 1.00 ft | Below flood stage | ±0 | 19 mi |
| Big Lost River near LeslieRiver gauge, Big Lost River | 69.2 cfs | Normal | −9.8 cfs | 11 mi |
| Big Lost River below Moore Diversion near MooreRiver gauge, Big Lost River | 0.0 cfs | Low | ±0 | 18 mi |
| Big Lost River at Arco at Sunset RoadRiver gauge, Big Lost River | 0.0 cfs | Normal | ±0 | 26 mi |
| Big Lost River near ArcoRiver gauge, Big Lost River | 2.01 ft | Below flood stage | ±0 | 31 mi |
Nearby gauges
| Gauge | Level | Compared with normal | 24 hours | Distance |
|---|---|---|---|---|
| Lower Cedar Creek above Divs near MackayRiver gauge, Lower Cedar Creek | 10.8 cfs | Normal | ±0 | 4.0 mi |
| Warm Springs Creek below Diversion near MackayRiver gauge, Warm Springs Creek | 42.7 cfs | High | ±0 | 8 mi |
| Thousand Springs Creek near ChillyRiver gauge, Thousand Springs Creek | 5.1 cfs | Normal | −0.3 cfs | 13 mi |
| Antelope Creek near DarlingtonRiver gauge, Antelope Creek | 4.55 ft | Below flood stage | ±0 | 16 mi |
| Nf Big Lost River at Wild Horse near ChillyRiver gauge, Nf Big Lost River | 1.51 ft | Below flood stage | −0.01 ft | 23 mi |
| Little Lost River below Wet Creek near HoweRiver gauge, Little Lost River | 1.14 ft | Below flood stage | ±0 | 24 mi |
Questions and answers
What is flood stage for the Big Lost River below Mackay Reservoir near Mackay?
The official flood stage is 4.30 ft. The level is currently 2.70 ft below it.
Is gage height the same as water depth?
No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.
What is the water level of Big Lost River below Mackay Reservoir near Mackay today?
On Oct 20, 2026, 02:45 PM MDT, the water level was 1.60 ft. Steady over the last 24 hours.
Is Big Lost River below Mackay Reservoir near Mackay rising or falling?
Steady over the last 24 hours.
Is the level of Big Lost River below Mackay Reservoir near Mackay normal?
Below flood stage. Judged against the official flood stage for this gauge.
What is the highest water level ever recorded at Big Lost River below Mackay Reservoir near Mackay?
The highest level on record is 6.08 ft on June 6, 1986.
Is Big Lost River below Mackay Reservoir near Mackay expected to rise?
The forecast expects the river to fall to 1.60 ft by Tuesday, October 20 at 12:00 PM.
For specialists
Station codes, datum, parameters, data quality and downloads
- Operator
- U.S. Geological Survey
- Station code
usgs:13127000(Agency page)- Coordinates
43.93917, -113.64833(WGS84)- Vertical datum
- NAVD88
- Update interval
- every 15 minutes
- Licence
- Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision
Published series
| Parameter | Last value | Time (UTC) | Quality |
|---|---|---|---|
| Water level | 1.60 ft | 2026-10-20 20:45 | Provisional |
| Flow | 74.7 cfs | 2026-10-20 20:45 | Provisional |
Download
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How to cite
U.S. Geological Survey: Big Lost River below Mackay Reservoir near Mackay (usgs:13127000). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/idaho/big-lost-river-below-mackay-reservoir-near-mackay
How we check values
Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.
Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer