About this river
O'Neil Ditch is a 1.9 mile canal near Boxwood Gulch Ranch in Colorado. Streamflow is measured at the USGS gauge Tarryall Creek at Upper Station near Como, CO (site 06696980). The mapped line runs from 39.3405, -105.9206 to 39.3226, -105.9043. The National Hydrography Dataset places it at stream order 4. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1978 to 2026
O'Neil Ditch typically runs highest in June, at a median 62 cfs, and lowest in February, at 3.5 cfs. The highest flow on record for any single day is 402 cfs, in 2015.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 3.8 | 2.6 to 5.6 | |
| February | 3.5 | 3.0 to 4.5 | |
| March | 4.0 | 3.3 to 4.7 | |
| April | 5.3 | 4.0 to 6.8 | |
| May | 20 | 18 to 29 | |
| June | 62 | 41 to 85 | |
| July | 21 | 17 to 35 | |
| August | 14 | 9.8 to 18 | |
| September | 9.6 | 7.5 to 12 | |
| October | 7.2 | 5.2 to 9.1 | |
| November | 6.5 | 6.0 to 7.3 | |
| December | 5.3 | 4.6 to 5.7 |
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 9 years of record. Statistics published by the US Geological Survey for Tarryall Creek at Upper Station near Como, CO (site 06696980). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show O'Neil Ditch'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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