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Weather Forecast Office Wilmington, OH Ohio River Forecast Center

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Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels
Chance of Exceeding Levels
During Entire Period
Ohio River at Portsmouth Observed crest: 16.96 ft at 2:00pm Nov 23 Observed: 15.64 ft at 10:00pm Nov 20 Observed: 15.58 ft at 11:00pm Nov 20 Observed: 15.51 ft at 12:00am Nov 21 Observed: 15.45 ft at 1:00am Nov 21 Observed: 15.43 ft at 2:00am Nov 21 Observed: 15.29 ft at 3:00am Nov 21 Observed: 15.26 ft at 4:00am Nov 21 Observed: 15.14 ft at 5:00am Nov 21 Observed: 15.06 ft at 6:00am Nov 21 Observed: 15.02 ft at 7:00am Nov 21 Observed: 15.08 ft at 8:00am Nov 21 Observed: 15.11 ft at 9:00am Nov 21 Observed: 15.21 ft at 10:00am Nov 21 Observed: 15.3 ft at 11:00am Nov 21 Observed: 15.29 ft at 12:00pm Nov 21 Observed: 15.41 ft at 1:00pm Nov 21 Observed: 15.55 ft at 2:00pm Nov 21 Observed: 15.66 ft at 3:00pm Nov 21 Observed: 15.74 ft at 4:00pm Nov 21 Observed: 15.83 ft at 5:00pm Nov 21 Observed: 15.87 ft at 6:00pm Nov 21 Observed: 15.93 ft at 7:00pm Nov 21 Observed: 15.96 ft at 8:00pm Nov 21 Observed: 16.02 ft at 9:00pm Nov 21 Observed: 16.06 ft at 10:00pm Nov 21 Observed: 16.1 ft at 11:00pm Nov 21 Observed: 16.16 ft at 12:00am Nov 22 Observed: 16.18 ft at 1:00am Nov 22 Observed: 16.22 ft at 2:00am Nov 22 Observed: 16.21 ft at 3:00am Nov 22 Observed: 16.16 ft at 4:00am Nov 22 Observed: 16.16 ft at 5:00am Nov 22 Observed: 16.13 ft at 6:00am Nov 22 Observed: 16.14 ft at 7:00am Nov 22 Observed: 16.14 ft at 8:00am Nov 22 Observed: 16.16 ft at 9:00am Nov 22 Observed: 16.21 ft at 10:00am Nov 22 Observed: 16.24 ft at 11:00am Nov 22 Observed: 16.29 ft at 12:00pm Nov 22 Observed: 16.34 ft at 1:00pm Nov 22 Observed: 16.44 ft at 2:00pm Nov 22 Observed: 16.5 ft at 3:00pm Nov 22 Observed: 16.55 ft at 4:00pm Nov 22 Observed: 16.59 ft at 5:00pm Nov 22 Observed: 16.64 ft at 6:00pm Nov 22 Observed: 16.49 ft at 7:00pm Nov 22 Observed: 16.7 ft at 8:00pm Nov 22 Observed: 16.69 ft at 9:00pm Nov 22 Observed: 16.7 ft at 10:00pm Nov 22 Observed: 16.7 ft at 11:00pm Nov 22 Observed: 16.71 ft at 12:00am Nov 23 Observed: 16.73 ft at 1:00am Nov 23 Observed: 16.69 ft at 2:00am Nov 23 Observed: 16.69 ft at 3:00am Nov 23 Observed: 16.71 ft at 4:00am Nov 23 Observed: 16.71 ft at 5:00am Nov 23 Observed: 16.72 ft at 6:00am Nov 23 Observed: 16.73 ft at 7:00am Nov 23 Observed: 16.82 ft at 8:00am Nov 23 Observed: 16.87 ft at 9:00am Nov 23 Observed: 16.94 ft at 10:00am Nov 23 Observed: 16.92 ft at 11:00am Nov 23 Observed: 16.93 ft at 12:00pm Nov 23 Observed: 16.95 ft at 1:00pm Nov 23 Observed: 16.96 ft at 2:00pm Nov 23 Observed: 16.96 ft at 3:00pm Nov 23 Observed: 16.9 ft at 4:00pm Nov 23 Observed: 16.84 ft at 5:00pm Nov 23 Observed: 16.8 ft at 6:00pm Nov 23 Observed: 16.77 ft at 7:00pm Nov 23 Observed: 16.68 ft at 8:00pm Nov 23 Observed: 16.56 ft at 9:00pm Nov 23 Forecast: 16.7 ft at 1:00pm Nov 23 Forecast: 16.4 ft at 7:00pm Nov 23 Forecast: 15.9 ft at 1:00am Nov 24 Forecast: 15.6 ft at 7:00am Nov 24 Forecast: 15.5 ft at 1:00pm Nov 24 Forecast: 15.4 ft at 7:00pm Nov 24 Forecast: 15.4 ft at 1:00am Nov 25 Forecast: 15.3 ft at 7:00am Nov 25 Forecast: 15.2 ft at 1:00pm Nov 25 Forecast: 15.2 ft at 7:00pm Nov 25 Forecast: 15.2 ft at 1:00am Nov 26 Forecast: 15.2 ft at 7:00am Nov 26 Forecast: 15.2 ft at 1:00pm Nov 26 Forecast: 15.1 ft at 7:00pm Nov 26 Forecast: 15.1 ft at 1:00am Nov 27 Forecast: 15 ft at 7:00am Nov 27 Forecast: 14.9 ft at 1:00pm Nov 27 Forecast: 14.9 ft at 7:00pm Nov 27 Forecast: 14.8 ft at 1:00am Nov 28 Forecast: 14.7 ft at 7:00am Nov 28 Graph Created (10:12pm Nov 23, 2009) Observed Forecast (issued 9:33am Nov 23)  USGS--Water Resources of the United States PORO1 (plotting HGIRG)   Gage 0  Datum: 470.90 Latest observed value: 16.56 ft at 9:00 PM EST 23-Nov-2009. Flood Stage is 50.0 ft.   Stage (ft) Flow (kcfs)
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Datum: N/A
Metadata
Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Ohio River at Portsmouth are issued routinely year-round.

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Upstream Gauge - at Lloyd Greenup Lock Upstream Gauge Downstream Gauge Downstream Gauge - at Maysville

Flood Categories (in feet)
Major Flood Stage:66
Moderate Flood Stage:57
Flood Stage:50
Action Stage:35

Historical Crests
(1) 74.23 ft on 01/27/1937
(2) 67.90 ft on 03/31/1913
(3) 66.26 ft on 02/12/1884
(4) 64.90 ft on 03/09/1945
(5) 64.10 ft on 04/17/1948
(6) 61.20 ft on 01/03/1943
(7) 60.80 ft on 03/12/1964
(8) 60.60 ft on 03/09/1955
(9) 59.80 ft on 03/04/1997
(10) 59.70 ft on 03/09/1963
Show More Historical Crests

Low Water Records
(1) 0.9 ft on 10/21/1920
(2) 1.2 ft on 10/29/1895
(3) 1.3 ft on 09/15/1881

Ohio River at Portsmouth location map

Flood Impacts Collapse
74.2 This flood will exceed the highest stage on record. Widespread damage occurs. Backwater flooding along the Scioto River produces additional damage to homes...farms and businesses. The City of Portsmouth is protected to a stage of 77 feet by the flood walls. Evacuations of homes and businesses east of Portsmouth and elsewhere along the Ohio River within Scioto County will be required.
62.0 Water rises onto the east end of the Scioto River Bridge...and significant flooding occurs in many areas outside of Portsmouth in Scioto and Adams Counties along the Ohio River. Areas hardest hit include South Portsmouth...Fullerton and low lying areas near Friendship.
60.0 The low area along Main Street in Fullerton Ohio becomes flooded. More homes are affected by flood waters in South Portsmouth. Long stretches of US Route 52 are flooded.
56.0 Flooding through Scioto County continues...with water entering lower levels of homes in Fullerton.
55.0 Backwater flooding affects portions of Sciotoville...New Boston and other sections outside of the flood wall area. Portions of Route 52 become flooded.
53.0 Water enters lower levels of homes in South Portsmouth. Backwater flooding from the Ohio River worsens...especially along the Ohio side of the river...through Scioto and Adams Counties.
51.0 Low lying flooding occurs along the southern border of Scioto County...as well as in South Portsmouth.
50.0 Lowland flooding has already begun to affect southern Scioto County. Backwater flooding begins into the Scioto River...as well as along smaller creeks flowing into the Ohio River.

About This Location Collapse
Latitude: 38.731389° N, Longitude: 82.996944° W, Horizontal Datum: NAD83

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 50 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 470.9 ft 520.9 ft  

Other Data Sources:
Corps of Engineers (COE) Info for Portsmouth
U.S. Geological Survey (USGS) Data and Site Info for Portsmouth

Additional Information Collapse
'Normal' pool elevation is 14.2'

Resources Collapse
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
Wilmington Weather Forecast Office
1901 South State Route 134
Wilmington, OH 45177
(937) 383-0031
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Page last modified: 29-Jun-2009 10:11 PM
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