About this river
Big Thompson River is a 5.6 mile river near Lake Estes Marina in Colorado. Streamflow is measured at the USGS gauge Big Thompson below Moraine Park near Estes Park, CO (site 402114105350101). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1996 to 2026
Big Thompson River typically runs highest in June, at a median 255 cfs, and lowest in February, at 3.6 cfs. The highest flow on record for any single day is 761 cfs, in 2013.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 4.1 | 3.1 to 5.6 | |
| February | 3.6 | 2.8 to 4.6 | |
| March | 5.5 | 3.6 to 7.6 | |
| April | 17 | 11 to 28 | |
| May | 116 | 75 to 179 | |
| June | 255 | 165 to 328 | |
| July | 101 | 66 to 135 | |
| August | 40 | 27 to 55 | |
| September | 19 | 14 to 27 | |
| October | 12 | 10 to 19 | |
| November | 8.8 | 7.0 to 11 | |
| December | 5.8 | 5.0 to 6.6 |
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 27 years of record. Statistics published by the US Geological Survey for Big Thompson below Moraine Park near Estes Park, CO (site 402114105350101). 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 Big Thompson River'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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