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Rock River at Lake Koshkonong, WI (NVLW3)


Data Type




Inundation Levels
NAVD88 Stage

787.818.0
786.817.0
785.816.0
Record Crest: 15.12 ft
784.815.0
783.814.0
782.813.0
781.812.0
781.311.5

Major Flooding Begins

780.811.0

Moderate Flooding Begins

779.810.0

Minor Flooding Begins

778.89.0

Near Flooding Begins

* = Extended rating
Weather Forecast Office Milwaukee/Sullivan, WI North Central River Forecast Center
Hydrograph River at a Glance Download Inundation
Mapping
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Click on mapped inundation to see water depth values for that location, or hold shift and drag to zoom to area.

Current Stage:
8.8 ft at 05/29/2017 21:30:00 UTC
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Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
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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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Map Overlays

Flood Categories (in feet)
Major Flood Stage: 11.5
Moderate Flood Stage: 11
Flood Stage: 10
Action Stage: 9
Low Stage (in feet): -9999

Historic Crests
(1) 15.12 ft on 06/22/2008
(2) 12.39 ft on 04/23/2013
(3) 12.23 ft on 04/25/1993
(4) 11.65 ft on 04/18/2008
(5) 11.49 ft on 06/05/2004
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 8.76 ft on 12/21/2015
(2) 9.68 ft on 07/08/2014
(3) 10.02 ft on 06/30/2013
(4) 12.39 ft on 04/23/2013
(5) 10.09 ft on 03/30/2011
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 4.99 ft on 12/06/2012
(2) 5.10 ft on 12/28/1999
(3) 5.52 ft on 11/05/2015
(4) 5.74 ft on 09/12/2003
(5) 5.84 ft on 07/13/2012
Show More Low Water Records

Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.

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If you notice any errors in the below information, please contact our Webmaster
14 There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Ralph road, Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
13 There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Ralph Road, Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
12 There is widespread flooding of lakeside homes and roads in the Lake Koshkonong area including Ralph Road, Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
11.26 There is knee-deep water over Backhawk Island Road. Lamp Road on west side of river also becomes flooded. Lake Koshkonong merges with Mud Lake to the east of Lake Koshkonong.
11.1 There is widespread flooding of roads and docks in the Town of Koshkonong and Town of Sumner including Ralph Road, Vets Lane, Blackhawk Island Road and Oxbow Bend Road.
11 In the Town of Lake Koshkonong, floodwaters affect Ralph Road, Vets Lane, Blackhawk Island Road, Fox Hill Road, and Oxbow Bend Road.
10.5 Floodwaters reach Oxbow Bend Road in the area of the gage on the east side of the lake.
10 Floodwaters affect homes and boat docks in the Blackhawk Island area of Lake Koshkonong on the north side of the lake. Floodwaters spread over low spots on Blackhawk Island Road in the area where the Rock River enters the lake.
9.5 Water is into low lying areas along Lake Koshkonong.
9 Water spreads into low lying areas along Lake Koshkonong.
Photos
(1) April_2013_flooding_1_Lk_Koshkonong
(2) Indianford dam covered with floodwaters-April 2013
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Page last modified: 21-Dec-2016 5:25 PM
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Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.