Rivermatics

USGS Streamgage 12101100

Lake Tapps Diversion at Dieringer, WA

Lake Tapps Diversion at Dieringer, WA is USGS streamgage 12101100 in Washington, monitoring river discharge in hydrologic subbasin 17110014. Discharge records at this site go back to 1958. Typical flow runs near 609.2 cfs in July and 782.2 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead, alongside daily high and low water-temperature forecasts.

View live conditions & forecast →

Gauge details

State
Washington
Gauge elevation
51 ft
Subbasin (HUC-8)
17110014
Coordinates
47.23816, -122.22817
USGS site number
12101100
Records begin
1958-05-01 (68 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Lake Tapps Diversion at Dieringer, WA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
24 24.5 24.9
23.8 24.5 25.3
23.4 25 31.4
23.3 24.7 29.4
22.8 24.6 29.2
22.3 24.5 29.7
21.8 24.4 30.6
21.4 24.3 30
21 24.2 29.5
20.7 24.1 31.3
20.4 24 31.2
20.2 23.9 30.8
20 23.8 30.1
19.7 23.7 30.3

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 68 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 24.5 885 1,703.9
February 15.7 683.5 1,673.8
March 12.2 748 1,589.4
April 12.3 782.2 1,620.3
May 15.8 678.8 1,613.5
June 14.5 956.1 1,768.3
July 9.7 609.2 1,478.4
August 3 185.5 996.8
September 6.6 303.6 897
October 14.7 370.8 1,038.6
November 32.1 587.6 1,409.3
December 17.7 748.4 1,582.3

All values in cubic feet per second (cfs).

Common questions

When does Lake Tapps Diversion at Dieringer, WA normally run highest?
June, on the long-term record. The median daily flow that month is about 956.1 cfs, against 185.5 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Lake Tapps Diversion at Dieringer, WA?
It depends on the month. In January, half of days historically fall near 885 cfs, with the middle 80% of days between 24.5 and 1,703.9 cfs. The month-by-month table on this page gives the full range.
How long has Lake Tapps Diversion at Dieringer, WA been measured?
Discharge records at USGS site 12101100 begin in 1958, about 68 years, covering roughly 9,085 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Lake Tapps Diversion at Dieringer, WA?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. A companion model forecasts each day's water-temperature high and low. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Lake Tapps Diversion at Dieringer, WA?
The gauge sits at 47.23816, -122.22817, in Washington, in hydrologic subbasin 17110014, at an elevation of about 51 feet.
Can I use Lake Tapps Diversion at Dieringer, WA 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