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Hydrograph River at a Glance Download
Johnson Creek near Sycamore Stage (ft)Flow (cfs)Highest Observation: 0 ft at 7:45AM Sep 23, 2014Highest Observation: 0 ft at 8:00AM Sep 23, 2014Highest Observation: 0 ft at 8:15AM Sep 23, 2014Highest Observation: 0 ft at 8:30AM Sep 23, 2014Forecast: 1.31 ft 11:00AM Sep 23, 2014Forecast: 1.32 ft 5:00PM Sep 23, 2014Forecast: 1.36 ft 11:00PM Sep 23, 2014Forecast: 2.06 ft 5:00AM Sep 24, 2014Highest Forecast: 2.11 ft 11:00AM Sep 24, 2014Forecast: 1.8 ft 5:00PM Sep 24, 2014Forecast: 1.63 ft 11:00PM Sep 24, 2014Forecast: 1.49 ft 5:00AM Sep 25, 2014Forecast: 1.5 ft 11:00AM Sep 25, 2014Forecast: 1.4 ft 5:00PM Sep 25, 2014Forecast: 1.37 ft 11:00PM Sep 25, 2014Forecast: 1.35 ft 5:00AM Sep 26, 2014Forecast: 1.4 ft 11:00AM Sep 26, 2014Forecast: 1.33 ft 5:00PM Sep 26, 2014Forecast: 1.3 ft 11:00PM Sep 26, 2014Forecast: 1.28 ft 5:00AM Sep 27, 2014Forecast: 1.26 ft 11:00AM Sep 27, 2014Forecast: 1.25 ft 5:00PM Sep 27, 2014Forecast: 1.25 ft 11:00PM Sep 27, 2014Forecast: 1.25 ft 5:00AM Sep 28, 2014USGS--Water Resources of the United StatesSYCO3(plotting HGIRG) Graph Created (9:18AM Sep 23, 2014)ObservedForecast (issued 9:08AM Sep 23)Latest observed value: 0 ft at 8:30 AM PDT 23-Sep-2014. Flood Stage is 11 ft
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Tabular Data (UTC)
Tabular Data (PDT)
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Datum: Not Available
NOTE: Forecasts for the Johnson Creek near Sycamore are issued routinely year-round.
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Upstream Gauge - at Gresham Upstream Gauge Downstream Gauge Downstream Gauge - at Milwaukie
Flood Categories (in feet)
Major Flood Stage:14
Moderate Flood Stage:0
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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(P): Preliminary values subject to further review.

Low Water Records
(1) 0.33 ft on 08/14/1940
(2) 0.65 ft on 08/18/1959
(3) 0.70 ft on 09/06/1955
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Zoom Level:16
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
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14 Above 14 ft, Expect widespread flooding of residential and commercial areas along johnson creek.
13 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 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.
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Latitude: 45.477500° N, Longitude: 122.508333° W, Horizontal Datum: NAD83/WGS84

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)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 228.47 ft 239.47 ft  

Current/Historical Observations:

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Archived/Historical Data at USACE DataQuery
10-day Forecast/Trend, Northwest River Forecast Center
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Page last modified: 5-Aug-2014 6:36 PM
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