USGS Streamgage 06818750
Platte River near Diagonal, IA
Platte River near Diagonal, IA is USGS streamgage 06818750, monitoring river discharge in hydrologic subbasin 10240012. It drains a watershed of about 217 square miles. Discharge records at this site go back to 1967. Typical flow runs near 17.6 cfs in July and 74.6 cfs in April, with the higher of the two arriving in April.
Gauge details
- Drainage area
- 217 sq mi
- Gauge elevation
- 1,100 ft
- Subbasin (HUC-8)
- 10240012
- Coordinates
- 40.76916, -94.40524
- USGS site number
- 06818750
- Records begin
- 1967-06-01 (59 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 24 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 | 1.4 | 11.9 | 122.8 | |
| February | 3.1 | 23.9 | 458.8 | |
| March | 11.9 | 76.2 | 657.5 | |
| April | 8.3 | 74.6 | 874.1 | |
| May | 9.1 | 65.1 | 791.4 | |
| June | 4.4 | 45.5 | 574.8 | |
| July | 2.8 | 17.6 | 394.9 | |
| August | 2.4 | 10 | 144.3 | |
| September | 2.3 | 6.9 | 219 | |
| October | 2.3 | 8.8 | 273.6 | |
| November | 3.4 | 21.1 | 270.6 | |
| December | 2.6 | 17.5 | 184.5 |
All values in cubic feet per second (cfs).
Common questions
- When does Platte River near Diagonal, IA normally run highest?
- March, on the long-term record. The median daily flow that month is about 76.2 cfs, against 6.9 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Platte River near Diagonal, IA?
- It depends on the month. In January, half of days historically fall near 11.9 cfs, with the middle 80% of days between 1.4 and 122.8 cfs. The month-by-month table on this page gives the full range.
- How long has Platte River near Diagonal, IA been measured?
- Discharge records at USGS site 06818750 begin in 1967, about 59 years. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Platte River near Diagonal, IA?
- The gauge sits at 40.76916, -94.40524, in hydrologic subbasin 10240012, at an elevation of about 1,100 feet, draining roughly 217 square miles.
- Can I use Platte River near Diagonal, IA 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.