USGS Streamgage 09013500
East Inlet near Grand Lake, CO
East Inlet near Grand Lake, CO is USGS streamgage 09013500 in Colorado, monitoring river discharge in hydrologic subbasin 14010001. It drains a watershed of about 27 square miles. Discharge records at this site go back to 1947. Typical flow runs near 85.1 cfs in July and 12.2 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Colorado
- Drainage area
- 27 sq mi
- Gauge elevation
- 8,411 ft
- Subbasin (HUC-8)
- 14010001
- Coordinates
- 40.23637, -105.79834
- USGS site number
- 09013500
- Records begin
- 1947-10-01 (79 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 8 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | — | 2.7 | — | |
| February | — | 2.4 | — | |
| March | — | 2.1 | — | |
| April | — | 12.2 | — | |
| May | — | 88.6 | — | |
| June | — | 227.9 | — | |
| July | — | 85.1 | — | |
| August | — | 26.6 | — | |
| September | — | 9.5 | — | |
| October | — | 9 | — | |
| November | — | 4.9 | — | |
| December | — | 3.1 | — |
All values in cubic feet per second (cfs).
Common questions
- When does East Inlet near Grand Lake, CO normally run highest?
- June, on the long-term record. The median daily flow that month is about 227.9 cfs, against 2.1 cfs in March, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- How long has East Inlet near Grand Lake, CO been measured?
- Discharge records at USGS site 09013500 begin in 1947, about 79 years. The long record is what makes the monthly percentiles on this page meaningful.
- Where is East Inlet near Grand Lake, CO?
- The gauge sits at 40.23637, -105.79834, in Colorado, in hydrologic subbasin 14010001, at an elevation of about 8,411 feet, draining roughly 27 square miles.
- Can I use East Inlet near Grand Lake, CO data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Other gauges in this subbasin
- Grand Lake Outlet below Chipmunk Ln at Grand Lake, CO
- Colorado River below Shadow Mountain Reservoir, CO
- Colorado River below Lake Granby, CO
- Colorado River near Granby, CO
- Willow Creek below Cabin Creek near Granby, CO
- Willow Creek above Willow Creek Reservoir, CO
- Willow Creek below Willow Creek Reservoir, CO
- Fraser River at Upper Sta, near Winter Park, CO