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Portland Bureau of Transportation

We keep Portland moving

Phone: 503-823-5185

Fax: 503-823-7576

1120 SW Fifth Ave, Suite 800, Portland, OR 97204

More Contact Info

How to convert City of Portland datum to another datum

Below are two tables for converting City of Portland datum both to and from other datums.

To learn more about different types of datum and their historical backgrounds, the National Geodetic Survey maintains an informative list of Frequently Asked Questions.

Conversion Table 

Known Datum to Wanted Datum
CITY OF PORTLAND -1.375 USC & GS
1947
CITY OF PORTLAND -1.375 O.D.O.T. ORE
ST. HWY TRANS
CITY OF PORTLAND  -1.375 NGVD 29
(APPROX)
CITY OF PORTLAND -1.375 NGVD 27
(APPROX)
CITY OF PORTLAND +2.10 NAVD 88
(APPROX)
CITY OF PORTLAND  -2.92 WEATHER BUR GAGE
MORRISON BRIDGE
CITY OF PORTLAND -3.22 US ENG. GAGE
STARK ST.
CITY OF PORTLAND -3.22 US ENG. GAGE
VANCOUVER

 

Known Datum to Wanted Datum
USC & GS
1947
+1.375 CITY OF PORTLAND
O.D.O.T. ORE
ST. HWY TRANS
+1.375 CITY OF PORTLAND
NGVD 29
(APPROX)
 +1.375 CITY OF PORTLAND
NGVD 27
(APPROX)
+1.375 CITY OF PORTLAND
NAVD 88
(APPROX)
-2.10 CITY OF PORTLAND
WEATHER BUR GAGE
MORRISON BRIDGE
 +2.92 CITY OF PORTLAND
US ENG. GAGE
STARK ST.
+3.22 CITY OF PORTLAND
US ENG. GAGE
VANCOUVER
+3.22 CITY OF PORTLAND