Big Lost River below Mackay Reservoir
Critical Stages
3.8' - Action
4.3' - Flood
Moderate
Major
Latest Observation
Updated: 12:45 PM MST 12/15/25
Status: No Flooding
Stage: 1.45 ft
Flow: 0.0611 kcfs
Forecast
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 5 PM 12/15 | 1.45 | 0.0611 |
| 11 PM 12/15 | 1.45 | 0.0611 |
| 5 AM 12/16 | 1.45 | 0.0611 |
| 11 AM 12/16 | 1.45 | 0.0611 |
| 5 PM 12/16 | 1.45 | 0.0611 |
| 11 PM 12/16 | 1.45 | 0.0611 |
| 5 AM 12/17 | 1.45 | 0.0611 |
| 11 AM 12/17 | 1.45 | 0.0611 |
| 5 PM 12/17 | 1.45 | 0.0611 |
| 11 PM 12/17 | 1.45 | 0.0611 |
| 5 AM 12/18 | 1.45 | 0.0611 |
| 11 AM 12/18 | 1.45 | 0.0611 |
| 5 PM 12/18 | 1.45 | 0.0611 |
| 11 PM 12/18 | 1.45 | 0.0611 |
| 5 AM 12/19 | 1.45 | 0.0611 |
| 11 AM 12/19 | 1.45 | 0.0611 |
| 5 PM 12/19 | 1.45 | 0.0611 |
| 11 PM 12/19 | 1.45 | 0.0611 |
| 5 AM 12/20 | 1.45 | 0.0611 |
| 11 AM 12/20 | 1.45 | 0.0611 |
| 5 PM 12/20 | 1.45 | 0.0611 |
| 11 PM 12/20 | 1.45 | 0.0611 |
| 5 AM 12/21 | 1.45 | 0.0611 |
| 11 AM 12/21 | 1.45 | 0.0611 |
| 5 PM 12/21 | 1.45 | 0.0611 |
| 11 PM 12/21 | 1.45 | 0.0611 |
| 5 AM 12/22 | 1.45 | 0.0611 |
| 11 AM 12/22 | 1.45 | 0.0611 |
| 5 PM 12/22 | 1.45 | 0.0611 |
| 11 PM 12/22 | 1.45 | 0.0611 |
| 5 AM 12/23 | 1.45 | 0.0611 |
| 11 AM 12/23 | 1.45 | 0.0611 |
| 5 PM 12/23 | 1.45 | 0.0611 |
| 11 PM 12/23 | 1.45 | 0.0611 |
| 5 AM 12/24 | 1.45 | 0.0611 |
| 11 AM 12/24 | 1.45 | 0.0611 |
| 5 PM 12/24 | 1.45 | 0.0611 |
| 11 PM 12/24 | 1.45 | 0.0611 |
| 5 AM 12/25 | 1.45 | 0.0611 |
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 1:45 PM 12/15 | 1.45 | 0.0611 |
| 1:30 PM 12/15 | 1.45 | 0.0611 |
| 1:15 PM 12/15 | 1.45 | 0.0611 |
| 1:00 PM 12/15 | 1.45 | 0.0611 |
| 12:45 PM 12/15 | 1.45 | 0.0611 |
| 12:30 PM 12/15 | 1.45 | 0.0611 |
| 12:15 PM 12/15 | 1.45 | 0.0611 |
| 12:00 PM 12/15 | 1.45 | 0.0611 |
| 11:45 AM 12/15 | 1.45 | 0.0611 |
| 11:30 AM 12/15 | 1.45 | 0.0611 |
| 11:15 AM 12/15 | 1.45 | 0.0611 |
| 11:00 AM 12/15 | 1.45 | 0.0611 |
| 10:45 AM 12/15 | 1.45 | 0.0611 |
| 10:30 AM 12/15 | 1.45 | 0.0611 |
| 10:15 AM 12/15 | 1.45 | 0.0611 |
| 10:00 AM 12/15 | 1.45 | 0.0611 |
| 9:45 AM 12/15 | 1.45 | 0.0611 |
| 9:30 AM 12/15 | 1.45 | 0.0611 |
| 9:15 AM 12/15 | 1.45 | 0.0611 |
| 9:00 AM 12/15 | 1.45 | 0.0611 |
| 8:45 AM 12/15 | 1.45 | 0.0611 |
| 8:30 AM 12/15 | 1.45 | 0.0611 |
| 8:15 AM 12/15 | 1.45 | 0.0611 |
| 8:00 AM 12/15 | 1.45 | 0.0611 |
| 7:45 AM 12/15 | 1.45 | 0.0611 |
| 7:30 AM 12/15 | 1.45 | 0.0611 |
| 7:15 AM 12/15 | 1.45 | 0.0611 |
| 7:00 AM 12/15 | 1.45 | 0.0611 |
| 6:45 AM 12/15 | 1.45 | 0.0611 |
| 6:30 AM 12/15 | 1.45 | 0.0611 |
4.3' -
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.
3.8' -
Near bankfull from Mackay Dam through the Darlington Flats. Water is likely to start to seep in low-lying areas in the Darlington Flats.
| Date | Stage (ft) |
|---|---|
| Jun 6, 1986 | 6.08 |
| Jun 17, 1974 | 5.93 |
| Jun 14, 1965 | 5.89 |
| Jun 10, 1921 | 5.79 |
| May 26, 1958 | 5.65 |
| Jun 30, 1982 | 5.65 |
| Jun 9, 2006 | 5.52 |
| Jun 10, 2017 | 5.09 |
| May 27, 2018 | 4.95 |
| Jun 30, 2011 | 4.77 |
| Jun 21, 2009 | 4.64 |
| Jun 28, 2010 | 4.44 |
| Jun 17, 2019 | 4.19 |
| May 30, 2005 | 4.07 |
| Jun 5, 2012 | 4.05 |
| Jun 9, 2016 | 3.91 |
| Jun 11, 2013 | 3.3 |
| Jun 24, 2008 | 3.29 |
| Jun 10, 2015 | 3.15 |
| Jun 6, 2014 | 3.12 |
Data provided by the National Weather Service.
