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Updating Pennsylvania Streamgage Datums

Notification of Intent to Update Streamgage Datums

Over the next year, streamgage datums will be updated to reflect elevations in North American Vertical Datum of 1988 (NAVD88). 

blue sky above curved aggregate dam with water surface, trees, and grass
Survey equipment at Raystown Dam near Huntingdon, Pennsylvania. USGS measures datum (elevation) information as part of monitoring lake level as well as streamflow and stage below the dam. (Victor Cortes, USGS)

The USGS Pennsylvania Water Science Center will be updating the geodetic vertical elevations for our network of streamgages to the current datum of North American Vertical Datum of 1988 (NAVD88). Prior to a change in geodetic vertical elevation (gage datum) at a streamgage, USGS will provide a 90-day notification to users of the data.

Current and accurate geodetic vertical elevations provide a universally based datum that benefits Federal, State, and local agencies, along with engineers, academics, and others that use water-level information. These updates are also part of preparations for a future transition to the North American-Pacific Geopotential Datum of 2022 (NAPGD2022).

This update in geodetic vertical datum does not affect the location of the streamgage, nor the observed local gage height (stage) or discharge recorded at the streamgage. 

A list of streamgages with upcoming datum changes can be found below. This table will be updated monthly.

For more information on the streamgage datum conversion process, contact Marla Stuckey (mstuckey@usgs.gov).

 

USGS PaWSC Datum Conversion Table

Last updated 8/2/2022

[ft, feet; NAVD88, North American Vertical Datum of 1988; NGVD29, National Geodetic Vertical Datum of 1929; *, Different datum elevations were reported depending on the source]

Station Number Station Name Existing
Datum Elevation
(ft)
Existing Datum New
Datum
Elevation (NAVD88)
(ft)
Datum
Update
Date
03007800 Allegheny River at
Port Allegany, PA
1454.88 NGVD29     1454.4 11/1/2022
03015000 Conewango Creek at
Russell, PA
1221.77 NGVD29 1221.3 11/1/2022
03015310 Allegheny River bl
Conewango Creek
at Warren, PA
1169.04 NGVD29 1168.0 11/1/2022
03015500 Brokenstraw Creek at
Youngsville, PA
1186.92 NGVD29 1186.32 11/1/2022
03016000 Allegheny River at
West Hickory, PA
1059.9 NGVD29 1059.4 11/1/2022
03017500 Tionesta Creek at
Lynch, PA
1252.43 NGVD29 1252.0 11/1/2022
03033000 Allegheny River
near Rimer, PA
*813.2/831.5 NGVD29 812.6 11/1/2022
01427195 Equinunk Creek near
Dillontown, PA
*913.5/913 NAVD88     913.14 10/15/2022
01431500 Lackawaxen River at
Hawley, PA
869 NGVD29     868.45 10/15/2022
01432495 Shohola Creek near
Walker Lake, PA
*691.3/710 NAVD88     691.12 10/15/2022
01442500 Brodhead Creek at
Minisink Hills, PA
301.84 NGVD29     301.25 10/15/2022
01449360 Pohopoco Creek at
Kresgeville, PA
659.72 NGVD29     659.09 10/15/2022
01451000 Lehigh River at
Walnutport, PA
350.27 NGVD29     349.53 10/15/2022
01451400 Spring Creek at
Trexlertown, PA
359 NAVD88     365.93 10/15/2022
01451467 Leibert Creek at
Emmaus, PA
403 NAVD88     395.84 10/15/2022
01451500 Little Lehigh Creek near Allentown, PA 253.41 NGVD29     252.71 10/15/2022
01451630 Cedar Creek at Mouth
near Allentown, PA
258 NAVD88     257.64 10/15/2022
01451650 Little Lehigh Creek at
Tenth St. Br. at
Allentown
245.63 NGVD29     244.93 10/15/2022
01451800 Jordan Creek near
Schnecksville, PA
381.16 NGVD29     380.48 10/15/2022
01452500 Monocacy Creek at
Bethlehem, PA
247.24 NGVD29     246.54 10/15/2022
01470500 Schuylkill River at
Berne, PA
310.65 NGVD29     309.94 10/15/2022
01470755 Maiden Creek near
Virginville, PA
440 NGVD29     308 10/15/2022
01472000 Schuylkill River at
Pottstown, PA
117.86 NGVD29     116.92 10/15/2022
01475510 Darby Creek near
Darby, PA
*19.41/18.90 NGVD29     18.1 10/15/2022
01494850 East Branch Big Elk Creek
at Forestville, PA
410 NGVD29     395.2 10/15/2022
01516500 Corey Creek near
Mainesburg, PA
1337.5 NGVD29     1337.05 10/15/2022
01531500 Susquehanna River at Towanda, PA 694.38 NGVD29     693.70 10/15/2022
01532000 Towanda Creek near Monroeton, PA 765.53 NGVD29     764.84 10/15/2022
01533400 Susquehanna River at Meshoppen, PA 599.76 NGVD29     599.1 10/15/2022
01554000 Susquehanna River at
Sunbury, PA
408.61 NGVD29     407.90 10/15/2022
03032500 Redbank Creek at
St. Charles, PA
973.14 NGVD29     972.5 10/15/2022
01440400 Brodhead Creek near Analomink, PA 586.5 NGVD29     585.78 Updates made prior
to June 1, 2022 
01465500 Neshaminy Creek near Langhorne, PA 40.57 NGVD29     39.54 Updates made prior
to June 1, 2022 
01478120 East Branch White Clay
Creek at Avondale, PA
270 NGVD29     264.65 Updates made prior to
June 1, 2022 
01478137 Trout Run at
Avondale, PA
270 NGVD29     266.38 Updates made prior to
June 1, 2022 
01478185 Middle Branch White
Clay Creek near
West Grove,PA
406 NAVD88     396.6 Updates made prior to
June 1, 2022 
01478220 West Branch White Clay
Creek near
Chesterville, PA
             177.2 Updates made prior to
June 1, 2022 
01478245 White Clay Creek near
Strickersville, PA
120 NGVD29     113.4 Updates made prior to
June 1, 2022 
01480629 Buck Run at
Doe Run, PA
305.29 NGVD29     299.56 Updates made prior to
June 1, 2022 

 

 

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