About this river
Mack Wash is a 3.9 mile river near Rimrock Adventures in Colorado. Streamflow is measured at the USGS gauge Salt Creek near Mouth near Mack, CO. (site 09163492). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2021 to 2026
Mack Wash typically runs highest in September, at a median 173 cfs, and lowest in February, at 9.2 cfs. The highest flow on record for any single day is 410 cfs, in 2025.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 16 | 9.8 to 30 | |
| February | 9.2 | 8.5 to 23 | |
| March | 10 | 7.2 to 16 | |
| April | 70 | 35 to 150 | |
| May | 152 | 105 to 213 | |
| June | 116 | 93 to 152 | |
| July | 118 | 92 to 140 | |
| August | 151 | 118 to 182 | |
| September | 173 | 152 to 195 | |
| October | 155 | 126 to 203 | |
| November | 23 | 22 to 59 | |
| December | 15 | 13 to 30 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 4 years of record. Statistics published by the US Geological Survey for Salt Creek near Mouth near Mack, CO. (site 09163492). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Mack Wash's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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