Service Change Notice for Changes in Gage Zero Elevations

SERVICE CHANGE NOTICE

NATIONAL WEATHER SERVICE MARQUETTE MI

SAT SEP 05 2020

... CHANGE IN GAGE ZERO ELEVATION FOR MANY UPPER MICHIGAN’S RIVER GAGES...

TO:      Subscribers:

         -Family of Services

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network

         -Other NWS partners, users, employees

FROM:    Jordan Wendt

         Hydrology Program Manager

         WFO Marquette Negaunee, Michigan

SUBJECT: CHANGE IN GAGE ZERO ELEVATION FOR MANY UPPER MICHIGAN’S RIVER GAGES

Effective immediately, the following streams listed below have had their gage zero elevations changed by the USGS from [yyy.yy] feet above National Geodetic Vertical Datum of 1929 (NGVD 29) to [xxx.xx] feet above North American Vertical Datum of 1988 (NAVD 88). For these locations, Gage Zero is the elevation at which river stage is zero feet. The gages will remain at the same physical locations. Only the elevations of the Gage Zero have changed. This change is being made as part of an initiative to modernize vertical datums associated with stream gaging equipment. These changes in the Gage Zeros will not require a change in flood stage, flood categories, or flood impact stage levels.

Observations and forecasts (where applicable) will remain as stage reported in feet above Gage Zero for the stream gage for the below locations:

ALSM4…STURGEON RIVER NEAR ALSTON…709.64 TO 709.69 FEET

BESM4…BLACK RIVER NEAR BESSEMER…1154.31 TO 1154.23 FEET

BGLM4… WEST BRANCH ONTONAGON RIVER NEAR BERGLAND…1290.81 TO 1290.79 FEET

CRNM4…ESCANABA RIVER AT CORNELL…749.26 TO 749.36 FEET

CSPM4…IRON RIVER AT CASPIAN…1438.7 TO 1438.70 FEET

FRDM4…FORD RIVER NEAR HYDE…671.77 TO 681.71 FEET

GWDM4…ESCANABA RIVER AT GREENWOOD DIVISION…1454.57 TO 1457.72 FEET

HUMM4…MIDDLE BRANCH ESCANABA RIVER AT HUMBOLDT…1521.2 TO 1521.37 FEET

LGOM4…LAKE GOGEBIC NEAR BERGLAND…1292.7 TO 1297.67 FEET

MSQM4…MANISTIQUE RIVER NEAR MANISTIQUE…608.46 TO 608.42 FFET

NJNM4…STURGEON RIVER NEAR NAHMA JUNCTION…610.99 TO 611.01 FEET

ORCM4…CISCO BRANCH ONTONAGON RIVER AT CISCO LAKE…1672.69 TO 1672.65 FEET

PAUM4…MIDDLE BRANCH ONTONAGON RIVER AT PAULDING…1485.66 TO 1485.59 FEET

PRNM4…MIDDLE BRANCH ESCANABA RIVER NEAR PRINCETON…1102.68 TO 1103.02 FEET

RKLM4…ONTONAGON RIVER NEAR ROCKLAND…638.72 TO 638.66 FEET

SNWM4…STURGEON RIVER NEAR SIDNAW…1214.4 TO 1214.52 FEET

SZCM4…SCHWEITZER CREEK NEAR PALMER…1268.28 TO 1268.45 FEET

SZRM4…SCHWEITZER CREEK AT SCHEITZER RESERVOIR…1300.0 TO 1300.16 FEET

TAPM4…TAHQUAMENON RIVER NEAR PARADISE…698.03 TO 698.17 FEET

TRRM4…TRAP ROCK RIVER NEAR LAKE LINDEN…621.7 TO 621.71 FEET

The National Weather Service welcomes feedback. If you have any questions or comments included in this document, please contact:

Jordan Wendt

 HYDROLOGY PROGRAM MANAGER

 NATIONAL WEATHER SERVICE FORECAST OFFICE

 112 AIRPARK DRIVE SOUTH

 NEGAUNEE MI 49866

 Phone: (906) 475-5782 EXT. 493

 Email: Jordan.wendt@noaa.gov