About this river
Boulder and Left Hand Ditch is a 2.6 mile canal near The Flyfisher Guide Service in Colorado. Streamflow is measured at the USGS gauge Boulder Creek at North 75TH ST. near Boulder, CO (site 06730200). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1987 to 2026
Boulder and Left Hand Ditch typically runs highest in June, at a median 228 cfs, and lowest in February, at 24 cfs. The highest flow on record for any single day is 4,770 cfs, in 2013.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 27 | 14 to 45 | |
| February | 24 | 12 to 42 | |
| March | 30 | 13 to 48 | |
| April | 49 | 23 to 72 | |
| May | 142 | 97 to 203 | |
| June | 228 | 133 to 417 | |
| July | 120 | 77 to 202 | |
| August | 84 | 61 to 132 | |
| September | 52 | 36 to 74 | |
| October | 38 | 25 to 53 | |
| November | 27 | 9.8 to 51 | |
| December | 27 | 15 to 47 |
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 40 years of record. Statistics published by the US Geological Survey for Boulder Creek at North 75TH ST. near Boulder, CO (site 06730200). 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 Boulder and Left Hand Ditch's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
