    <SEC-DOCUMENT>0001437749-19-012323-index.html : 20190620
    <SEC-HEADER>0001437749-19-012323.hdr.sgml : 20190620
    <ACCEPTANCE-DATETIME>20190620100336
    ACCESSION NUMBER:		0001437749-19-012323
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		17
    CONFORMED PERIOD OF REPORT:	20190620
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20190620
    DATE AS OF CHANGE:		20190620

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			NORTHWEST PIPE CO
    		CENTRAL INDEX KEY:			0001001385
    		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL PIPE & TUBES [3317]
    		IRS NUMBER:				930557988
    		STATE OF INCORPORATION:			OR
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-27140
    		FILM NUMBER:		19907616

    	BUSINESS ADDRESS:
    		STREET 1:		201 NE PARK PLAZA DRIVE
    		STREET 2:		SUITE 100
    		CITY:			VANCOUVER
    		STATE:			WA
    		ZIP:			98684
    		BUSINESS PHONE:		3603976250

    	MAIL ADDRESS:
    		STREET 1:		201 NE PARK PLAZA DRIVE
    		STREET 2:		SUITE 100
    		CITY:			VANCOUVER
    		STATE:			WA
    		ZIP:			98684
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>nwpx20190409_8k.htm
    <DESCRIPTION>FORM 8-K
    <TEXT>
    Document 1 - file: nwpx20190409_8k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>ex_147939.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 2 - file: ex_147939.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>a01.jpg
    <TEXT>
    Document 3 - file: a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>a02a.jpg
    <TEXT>
    Document 4 - file: a02a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>a03.jpg
    <TEXT>
    Document 5 - file: a03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>a04.jpg
    <TEXT>
    Document 6 - file: a04.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>a05.jpg
    <TEXT>
    Document 7 - file: a05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>a06.jpg
    <TEXT>
    Document 8 - file: a06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>a07.jpg
    <TEXT>
    Document 9 - file: a07.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>a08.jpg
    <TEXT>
    Document 10 - file: a08.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>a09.jpg
    <TEXT>
    Document 11 - file: a09.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>a10.jpg
    <TEXT>
    Document 12 - file: a10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>a11.jpg
    <TEXT>
    Document 13 - file: a11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>a12.jpg
    <TEXT>
    Document 14 - file: a12.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>a13.jpg
    <TEXT>
    Document 15 - file: a13.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>a14.jpg
    <TEXT>
    Document 16 - file: a14.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>a15.jpg
    <TEXT>
    Document 17 - file: a15.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>