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Hydrograph River at a Glance Download  
Johnson Creek near Sycamore Observed: 2.83 ft at 2:30pm Nov 12 Observed: 2.77 ft at 3:00pm Nov 12 Observed: 2.73 ft at 3:30pm Nov 12 Observed: 2.69 ft at 4:00pm Nov 12 Observed: 2.65 ft at 4:30pm Nov 12 Observed: 2.61 ft at 5:00pm Nov 12 Observed: 2.59 ft at 5:30pm Nov 12 Observed: 2.56 ft at 6:00pm Nov 12 Observed: 2.53 ft at 6:30pm Nov 12 Observed: 2.51 ft at 7:00pm Nov 12 Observed: 2.49 ft at 7:30pm Nov 12 Observed: 2.47 ft at 8:00pm Nov 12 Observed: 2.44 ft at 8:30pm Nov 12 Observed: 2.43 ft at 9:00pm Nov 12 Observed: 2.41 ft at 9:30pm Nov 12 Observed: 2.39 ft at 10:00pm Nov 12 Observed: 2.38 ft at 10:30pm Nov 12 Observed: 2.36 ft at 11:00pm Nov 12 Observed: 2.35 ft at 11:30pm Nov 12 Observed: 2.33 ft at 12:00am Nov 13 Observed: 2.32 ft at 12:30am Nov 13 Observed: 2.31 ft at 1:00am Nov 13 Observed: 2.29 ft at 1:30am Nov 13 Observed: 2.29 ft at 2:00am Nov 13 Observed: 2.27 ft at 2:30am Nov 13 Observed: 2.26 ft at 3:00am Nov 13 Observed: 2.25 ft at 3:30am Nov 13 Observed: 2.24 ft at 4:00am Nov 13 Observed: 2.23 ft at 4:30am Nov 13 Observed: 2.23 ft at 5:00am Nov 13 Observed: 2.22 ft at 5:30am Nov 13 Observed: 2.21 ft at 6:00am Nov 13 Observed: 2.2 ft at 6:30am Nov 13 Observed: 2.19 ft at 7:00am Nov 13 Observed: 2.19 ft at 7:30am Nov 13 Observed: 2.19 ft at 8:00am Nov 13 Observed: 2.2 ft at 8:30am Nov 13 Observed: 2.22 ft at 9:00am Nov 13 Observed: 2.26 ft at 9:30am Nov 13 Observed: 2.33 ft at 10:00am Nov 13 Observed: 2.42 ft at 10:30am Nov 13 Observed: 2.52 ft at 11:00am Nov 13 Observed: 2.61 ft at 11:30am Nov 13 Observed: 2.67 ft at 12:00pm Nov 13 Observed: 2.7 ft at 12:30pm Nov 13 Observed: 2.7 ft at 1:00pm Nov 13 Observed: 2.69 ft at 1:30pm Nov 13 Observed: 2.67 ft at 2:00pm Nov 13 Observed: 2.64 ft at 2:30pm Nov 13 Observed: 2.63 ft at 3:00pm Nov 13 Observed: 2.62 ft at 3:30pm Nov 13 Observed: 2.63 ft at 4:00pm Nov 13 Observed: 2.66 ft at 4:30pm Nov 13 Observed: 2.69 ft at 5:00pm Nov 13 Observed: 2.73 ft at 5:30pm Nov 13 Observed: 2.74 ft at 6:00pm Nov 13 Observed: 2.73 ft at 6:30pm Nov 13 Observed: 2.71 ft at 7:00pm Nov 13 Observed: 2.69 ft at 7:30pm Nov 13 Observed: 2.69 ft at 8:00pm Nov 13 Observed: 2.69 ft at 8:30pm Nov 13 Observed: 2.68 ft at 9:00pm Nov 13 Observed: 2.65 ft at 9:30pm Nov 13 Observed: 2.62 ft at 10:00pm Nov 13 Observed: 2.59 ft at 10:30pm Nov 13 Observed: 2.57 ft at 11:00pm Nov 13 Observed: 2.53 ft at 11:30pm Nov 13 Observed: 2.51 ft at 12:00am Nov 14 Observed: 2.49 ft at 12:30am Nov 14 Observed: 2.47 ft at 1:00am Nov 14 Observed: 2.45 ft at 1:30am Nov 14 Observed: 2.43 ft at 2:00am Nov 14 Observed: 2.41 ft at 2:30am Nov 14 Observed: 2.39 ft at 3:00am Nov 14 Observed: 2.37 ft at 3:30am Nov 14 Observed: 2.36 ft at 4:00am Nov 14 Observed: 2.34 ft at 4:30am Nov 14 Observed: 2.33 ft at 5:00am Nov 14 Observed: 2.32 ft at 5:30am Nov 14 Observed: 2.3 ft at 6:00am Nov 14 Observed: 2.29 ft at 6:30am Nov 14 Observed: 2.28 ft at 7:00am Nov 14 Observed: 2.27 ft at 7:30am Nov 14 Observed: 2.26 ft at 8:00am Nov 14 Observed: 2.25 ft at 8:30am Nov 14 Observed: 2.23 ft at 9:00am Nov 14 Observed: 2.23 ft at 9:30am Nov 14 Observed: 2.22 ft at 10:00am Nov 14 Observed: 2.21 ft at 10:30am Nov 14 Observed: 2.2 ft at 11:00am Nov 14 Observed: 2.19 ft at 11:30am Nov 14 Observed: 2.19 ft at 12:00pm Nov 14 Observed: 2.18 ft at 12:30pm Nov 14 Observed: 2.17 ft at 1:00pm Nov 14 Observed: 2.16 ft at 1:30pm Nov 14 Observed: 2.16 ft at 2:00pm Nov 14 Observed: 2.15 ft at 2:30pm Nov 14 Observed: 2.14 ft at 3:00pm Nov 14 Observed: 2.13 ft at 3:30pm Nov 14 Observed: 2.13 ft at 4:00pm Nov 14 Observed: 2.12 ft at 4:30pm Nov 14 Observed: 2.11 ft at 5:00pm Nov 14 Observed: 2.11 ft at 5:30pm Nov 14 Observed: 2.1 ft at 6:00pm Nov 14 Observed: 2.1 ft at 6:30pm Nov 14 Observed: 2.09 ft at 7:00pm Nov 14 Observed: 2.09 ft at 7:30pm Nov 14 Observed: 2.08 ft at 8:00pm Nov 14 Observed: 2.08 ft at 8:30pm Nov 14 Observed: 2.07 ft at 9:00pm Nov 14 Observed: 2.07 ft at 9:30pm Nov 14 Observed: 2.06 ft at 10:00pm Nov 14 Observed: 2.06 ft at 10:30pm Nov 14 Observed: 2.05 ft at 11:00pm Nov 14 Observed: 2.05 ft at 11:30pm Nov 14 Observed: 2.04 ft at 12:00am Nov 15 Observed: 2.04 ft at 12:30am Nov 15 Observed: 2.03 ft at 1:00am Nov 15 Observed: 2.03 ft at 1:30am Nov 15 Observed: 2.02 ft at 2:00am Nov 15 Observed: 2.02 ft at 2:30am Nov 15 Observed: 2.02 ft at 3:00am Nov 15 Observed: 2.01 ft at 3:30am Nov 15 Observed: 2.01 ft at 4:00am Nov 15 Observed: 2 ft at 4:30am Nov 15 Observed: 2 ft at 5:00am Nov 15 Observed: 2 ft at 5:30am Nov 15 Observed: 2 ft at 6:00am Nov 15 Observed: 2 ft at 6:30am Nov 15 Observed: 2 ft at 7:00am Nov 15 Observed: 2 ft at 7:30am Nov 15 Observed: 2.01 ft at 8:00am Nov 15 Observed: 2.02 ft at 8:30am Nov 15 Observed: 2.02 ft at 9:00am Nov 15 Observed: 2.03 ft at 9:30am Nov 15 Observed: 2.04 ft at 10:00am Nov 15 Observed: 2.04 ft at 10:30am Nov 15 Observed: 2.04 ft at 11:00am Nov 15 Observed: 2.03 ft at 11:30am Nov 15 Observed: 2.03 ft at 12:00pm Nov 15 Observed: 2.02 ft at 12:30pm Nov 15 Observed: 2.01 ft at 1:00pm Nov 15 Observed: 2 ft at 1:30pm Nov 15 Observed: 2 ft at 2:00pm Nov 15 Observed: 2 ft at 2:30pm Nov 15 Observed: 1.99 ft at 3:00pm Nov 15 Observed: 1.99 ft at 3:30pm Nov 15 Observed: 1.98 ft at 4:00pm Nov 15 Observed: 1.98 ft at 4:30pm Nov 15 Observed: 1.98 ft at 5:00pm Nov 15 Observed: 1.98 ft at 5:30pm Nov 15 Observed: 1.98 ft at 6:00pm Nov 15 Observed: 1.98 ft at 6:30pm Nov 15 Observed: 1.97 ft at 7:00pm Nov 15 Observed: 1.97 ft at 7:30pm Nov 15 Observed: 1.97 ft at 8:00pm Nov 15 Observed: 1.96 ft at 8:30pm Nov 15 Observed: 1.96 ft at 9:00pm Nov 15 Observed: 1.96 ft at 9:30pm Nov 15 Observed: 1.95 ft at 10:00pm Nov 15 Observed: 1.95 ft at 10:30pm Nov 15 Observed: 1.94 ft at 11:00pm Nov 15 Observed: 1.94 ft at 11:30pm Nov 15 Observed: 1.94 ft at 12:00am Nov 16 Observed: 1.93 ft at 12:30am Nov 16 Observed: 1.93 ft at 1:00am Nov 16 Observed: 1.92 ft at 1:30am Nov 16 Observed: 1.92 ft at 2:00am Nov 16 Observed: 1.92 ft at 2:30am Nov 16 Observed: 1.91 ft at 3:00am Nov 16 Observed: 1.91 ft at 3:30am Nov 16 Observed: 1.91 ft at 4:00am Nov 16 Observed: 1.91 ft at 4:30am Nov 16 Observed: 1.91 ft at 5:00am Nov 16 Observed: 1.91 ft at 5:30am Nov 16 Observed: 1.9 ft at 6:00am Nov 16 Observed: 1.91 ft at 6:30am Nov 16 Observed: 1.9 ft at 7:00am Nov 16 Observed: 1.91 ft at 7:30am Nov 16 Observed: 1.91 ft at 8:00am Nov 16 Observed: 1.93 ft at 8:30am Nov 16 Observed: 1.95 ft at 9:00am Nov 16 Observed: 1.97 ft at 9:30am Nov 16 Observed: 1.98 ft at 10:00am Nov 16 Observed: 1.99 ft at 10:30am Nov 16 Observed: 2 ft at 11:00am Nov 16 Observed: 2 ft at 11:30am Nov 16 Observed: 2.01 ft at 12:00pm Nov 16 Observed: 2.01 ft at 12:30pm Nov 16 Observed: 2.01 ft at 1:00pm Nov 16 Observed: 2.01 ft at 1:30pm Nov 16 Observed: 1.99 ft at 2:00pm Nov 16 Observed: 1.98 ft at 2:30pm Nov 16 Observed: 1.96 ft at 3:00pm Nov 16 Observed: 1.95 ft at 3:30pm Nov 16 Observed: 1.94 ft at 4:00pm Nov 16 Observed: 1.94 ft at 4:30pm Nov 16 Observed: 1.93 ft at 5:00pm Nov 16 Observed: 1.93 ft at 5:30pm Nov 16 Observed: 1.93 ft at 6:00pm Nov 16 Observed: 1.93 ft at 6:30pm Nov 16 Observed: 1.93 ft at 7:00pm Nov 16 Observed: 1.92 ft at 7:30pm Nov 16 Observed: 1.92 ft at 8:00pm Nov 16 Observed: 1.92 ft at 8:30pm Nov 16 Observed: 1.91 ft at 9:00pm Nov 16 Observed: 1.91 ft at 9:30pm Nov 16 Observed: 1.9 ft at 10:00pm Nov 16 Observed: 1.9 ft at 10:30pm Nov 16 Observed: 1.89 ft at 11:00pm Nov 16 Observed: 1.89 ft at 11:30pm Nov 16 Observed: 1.88 ft at 12:00am Nov 17 Observed: 1.88 ft at 12:30am Nov 17 Observed: 1.88 ft at 1:00am Nov 17 Observed: 1.88 ft at 1:30am Nov 17 Observed: 1.88 ft at 2:00am Nov 17 Observed: 1.9 ft at 2:30am Nov 17 Observed: 1.95 ft at 3:00am Nov 17 Observed: 2.04 ft at 3:30am Nov 17 Observed: 2.2 ft at 4:00am Nov 17 Observed: 2.41 ft at 4:30am Nov 17 Observed: 2.63 ft at 5:00am Nov 17 Observed: 2.86 ft at 5:30am Nov 17 Observed: 3.03 ft at 6:00am Nov 17 Observed: 3.13 ft at 6:30am Nov 17 Observed: 3.17 ft at 7:00am Nov 17 Observed: 3.21 ft at 7:30am Nov 17 Observed: 3.23 ft at 8:00am Nov 17 Observed: 3.28 ft at 8:30am Nov 17 Observed: 3.34 ft at 9:00am Nov 17 Observed: 3.39 ft at 9:30am Nov 17 Observed: 3.44 ft at 10:00am Nov 17 Observed: 3.53 ft at 10:30am Nov 17 Observed: 3.61 ft at 11:00am Nov 17 Observed: 3.68 ft at 11:30am Nov 17 Observed: 3.73 ft at 12:00pm Nov 17 Observed: 3.75 ft at 12:30pm Nov 17 Observed: 3.74 ft at 1:00pm Nov 17 Observed: 3.71 ft at 1:30pm Nov 17 Observed: 3.66 ft at 2:00pm Nov 17 Observed: 3.59 ft at 2:30pm Nov 17 Observed: 3.52 ft at 3:00pm Nov 17 Observed: 3.46 ft at 3:30pm Nov 17 Observed: 3.39 ft at 4:00pm Nov 17 Observed: 3.33 ft at 4:30pm Nov 17 Observed: 3.26 ft at 5:00pm Nov 17 Observed: 3.19 ft at 5:30pm Nov 17 Observed: 3.13 ft at 6:00pm Nov 17 Observed: 3.08 ft at 6:30pm Nov 17 Observed: 3.03 ft at 7:00pm Nov 17 Observed: 2.99 ft at 7:30pm Nov 17 Observed: 2.95 ft at 8:00pm Nov 17 Observed: 2.91 ft at 8:30pm Nov 17 Observed: 2.87 ft at 9:00pm Nov 17 Observed: 2.83 ft at 9:30pm Nov 17 Observed: 2.8 ft at 10:00pm Nov 17 Observed: 2.77 ft at 10:30pm Nov 17 Observed: 2.74 ft at 11:00pm Nov 17 Observed: 2.72 ft at 11:30pm Nov 17 Observed: 2.69 ft at 12:00am Nov 18 Observed: 2.67 ft at 12:30am Nov 18 Observed: 2.65 ft at 1:00am Nov 18 Observed: 2.63 ft at 1:30am Nov 18 Observed: 2.6 ft at 2:00am Nov 18 Observed: 2.59 ft at 2:30am Nov 18 Observed: 2.57 ft at 3:00am Nov 18 Observed: 2.56 ft at 3:30am Nov 18 Observed: 2.54 ft at 4:00am Nov 18 Observed: 2.52 ft at 4:30am Nov 18 Observed: 2.5 ft at 5:00am Nov 18 Observed: 2.49 ft at 5:30am Nov 18 Observed: 2.48 ft at 6:00am Nov 18 Observed: 2.47 ft at 6:30am Nov 18 Observed: 2.45 ft at 7:00am Nov 18 Observed: 2.44 ft at 7:30am Nov 18 Observed: 2.44 ft at 8:00am Nov 18 Observed: 2.43 ft at 8:30am Nov 18 Observed: 2.42 ft at 9:00am Nov 18 Observed: 2.41 ft at 9:30am Nov 18 Observed: 2.41 ft at 10:00am Nov 18 Observed: 2.4 ft at 10:30am Nov 18 Observed: 2.4 ft at 11:00am Nov 18 Forecast: 4.56 ft at 10:00am Nov 22 Forecast: 4.53 ft at 4:00pm Nov 22 Forecast: 4.2 ft at 10:00pm Nov 22 Forecast: 3.72 ft at 4:00am Nov 23 Forecast: 3.31 ft at 10:00am Nov 23 Forecast: 2.96 ft at 4:00pm Nov 23 Forecast: 2.77 ft at 10:00pm Nov 23 Forecast: 2.7 ft at 4:00am Nov 24 Forecast: 2.61 ft at 10:00am Nov 24 Forecast: 2.52 ft at 4:00pm Nov 24 Forecast: 2.44 ft at 10:00pm Nov 24 Forecast: 2.37 ft at 4:00am Nov 25 Forecast: 2.32 ft at 10:00am Nov 25 Forecast: 2.27 ft at 4:00pm Nov 25 Forecast: 2.23 ft at 10:00pm Nov 25 Forecast: 2.2 ft at 4:00am Nov 26 Forecast: 2.17 ft at 10:00am Nov 26 Forecast: 2.2 ft at 4:00pm Nov 26 Forecast: 2.58 ft at 10:00pm Nov 26 Forecast: 2.79 ft at 4:00am Nov 27 Forecast: 2.84 ft at 10:00am Nov 27 Forecast: 2.8 ft at 4:00pm Nov 27 Forecast: 2.67 ft at 10:00pm Nov 27 Forecast: 2.6 ft at 4:00am Nov 28 Forecast: 2.48 ft at 10:00am Nov 28 Forecast: 2.37 ft at 4:00pm Nov 28 Forecast: 2.28 ft at 10:00pm Nov 28 Forecast: 2.2 ft at 4:00am Nov 29 Forecast: 2.15 ft at 10:00am Nov 29 Forecast: 2.1 ft at 4:00pm Nov 29 Forecast: 2.07 ft at 10:00pm Nov 29 Forecast: 2.04 ft at 4:00am Nov 30 Forecast: 2.02 ft at 10:00am Nov 30 Forecast: 2 ft at 4:00pm Nov 30 Forecast: 1.98 ft at 10:00pm Nov 30 Forecast: 1.95 ft at 4:00am Dec 1 Forecast: 1.93 ft at 10:00am Dec 1 Forecast: 1.91 ft at 4:00pm Dec 1 Forecast: 1.9 ft at 10:00pm Dec 1 Forecast: 1.88 ft at 4:00am Dec 2 Graph Created (3:02pm Nov 22, 2009) Observed Forecast (issued 8:36am Nov 22) USGS--Water Resources of the United States SYCO3 (plotting HGIRP) Gage 0 Datum: 228.47 Latest observed value: 2.4 ft at 11:00 AM PST 18-Nov-2009. Flood Stage is 11.0 ft. Stage (ft) Flow (kcfs)
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NOTE: Forecasts for the Johnson Creek near Sycamore are issued routinely year-round.

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Downstream Gauge Downstream Gauge - at Milwaukie

Flood Categories (in feet)
Major Flood Stage:14
Flood Stage:11
Action Stage:10

Historical Crests
(1) 15.30 ft on 11/19/1996
(2) 14.69 ft on 01/02/2009
(3) 14.68 ft on 12/22/1964
(4) 14.50 ft on 12/01/1937
(5) 14.28 ft on 02/07/1996
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Low Water Records
(1) 0.3 ft on 08/14/1940
(2) 0.7 ft on 08/18/1959
(2) 0.7 ft on 09/04/1956
Show More Low Water Records

Johnson Creek near Sycamore location map

Flood Impacts Collapse
14.0 ABOVE 14 FT...EXPECT WIDESPREAD FLOODING OF RESIDENTIAL AND COMMERCIAL AREAS ALONG JOHNSON CREEK.
13.0 ABOVE 13 FT...EXPECT FLOODING TO BEGIN AT NUMEROUS LOCATIONS ALONG JOHNSON CREEK. EVACUATIONS OF SEVERAL HOMES HAVE HISTORICALLY TAKEN PLACE AT THIS AND HIGHER STAGES.
11.0 ABOVE 11 FT...MINOR FLOODING BEGINS ALONG JOHNSON CREEK FROM SE 92ND ST TO SE 122ND ST AND BETWEEN JOHNSON CREEK AND SE HAROLD ST.

About This Location Collapse
Latitude: 45.478000° N, Longitude: 122.507000° W, Horizontal Datum: NAD83

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 11 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 N/A N/A Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 N/A N/A Older USGS topographic maps, NGVD29 benchmarks
MSL N/A N/A Older USGS topographic maps, MSL benchmarks
Other 228.47 ft 239.47 ft  

Other Data Sources:
U.S. Geological Survey (USGS) Data and Site Info for Sycamore

Additional Information Collapse
Archived/Historical Data at USACE DataQuery
10-day Forecast/Trend, Northwest River Forecast Center

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Hydrologic Resources
 Additional Resources
   

Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

NWS Information
National Weather Service
Portland Weather Forecast Office
5241 NE 122nd Avenue
Portland, OR 97230-1089
(503) 261-9246
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