Rivermatics

5 USGS Streamgages · Columbia River system

Johnson Creek flows and levels

Johnson Creek is gauged at 5 USGS streamgages in Oregon, each tracked by Rivermatics. The mainstem runs about 24 miles (38 km) from headwaters to outlet. It drains into the Columbia River system. Drainage area at the gauges ranges from 2 square miles at Johnson Creek at Se Bluff Rd, at Pleasant Home, OR up to 53 at Johnson Creek at Milwaukie, OR. Rivermatics issues a daily machine-learned 14-day flow outlook at 3 of them.

Gauges on this river, upstream to downstream

Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.

USGS streamgages on this river, ordered upstream to downstream
Gauge State Drainage sq mi Elevation ft April p50 cfs July p50 cfs Forecast
Johnson Creek at Se Bluff Rd, at Pleasant Home, OR OR 2 — — — —
Johnson Creek at Telford Road near Gresham, OR OR 5 — — — —
Johnson Creek at Regner Road, at Gresham, OR OR 15 — 24 1.9 14-day + temp
Johnson Creek at Sycamore, OR OR 27 — 31.8 2.4 14-day + temp
Johnson Creek at Milwaukie, OR OR 53 — 61.1 18.5 14-day + temp

Typical flow by month at Johnson Creek at Milwaukie, OR

The furthest-downstream gauge on this river, so the fullest flow it carries here. Long-term daily discharge percentiles from the USGS record (up to 36 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 42.4 107.6 360.7
February 34.1 87.2 302.7
March 35.5 82.4 247.3
April 27 61.1 161
May 19.2 37.2 112.7
June 15 26.3 60
July 13.1 18.5 28.3
August 11.9 17.1 25.3
September 12.5 17.7 34.4
October 14.3 23 69
November 19.8 57.9 211.8
December 32.2 95 379.3

All values in cubic feet per second (cfs).

Common questions

When does the Johnson Creek run highest?
January, on the long-term record at Johnson Creek at Milwaukie, OR — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 107.6 cfs that month, against 17.1 cfs in August, the lowest. Upstream gauges peak on their own schedule; the table on this page gives April and July for each.
How many gauges are on the Johnson Creek?
Rivermatics tracks 5 USGS streamgages on the Johnson Creek, across Oregon. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
Is there a flow forecast for the Johnson Creek?
Yes, at 3 of the 5 gauges. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on each basin's observed flows, weather and snowpack, and issues a daily outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on each gauge's live screen.
What river system is the Johnson Creek part of?
The Johnson Creek drains into the Columbia River system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
Can I use Johnson Creek 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 rivers in the Columbia River system

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