    <SEC-DOCUMENT>0001437749-18-011335-index.html : 20180606
    <SEC-HEADER>0001437749-18-011335.hdr.sgml : 20180606
    <ACCEPTANCE-DATETIME>20180606102021
    ACCESSION NUMBER:		0001437749-18-011335
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		17
    CONFORMED PERIOD OF REPORT:	20180606
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20180606
    DATE AS OF CHANGE:		20180606

    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:		18883140

    	BUSINESS ADDRESS:
    		STREET 1:		5721 SE COLUMBIA WAY
    		STREET 2:		SUITE 200
    		CITY:			VANCOUVER
    		STATE:			WA
    		ZIP:			98661
    		BUSINESS PHONE:		3603976250

    	MAIL ADDRESS:
    		STREET 1:		5721 SE COLUMBIA WAY
    		STREET 2:		SUITE 200
    		CITY:			VANCOUVER
    		STATE:			WA
    		ZIP:			98661
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>nwpx20180604_8k.htm
    <DESCRIPTION>FORM 8-K
    <TEXT>
    Document 1 - file: nwpx20180604_8k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>ex_115857.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 2 - file: ex_115857.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>slide15.jpg
    <TEXT>
    Document 3 - file: slide15.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>slide14.jpg
    <TEXT>
    Document 4 - file: slide14.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>slide13.jpg
    <TEXT>
    Document 5 - file: slide13.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>slide12.jpg
    <TEXT>
    Document 6 - file: slide12.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>slide11.jpg
    <TEXT>
    Document 7 - file: slide11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>slide10.jpg
    <TEXT>
    Document 8 - file: slide10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>slide09.jpg
    <TEXT>
    Document 9 - file: slide09.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>slide08.jpg
    <TEXT>
    Document 10 - file: slide08.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>slide07.jpg
    <TEXT>
    Document 11 - file: slide07.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>slide06.jpg
    <TEXT>
    Document 12 - file: slide06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>slide05.jpg
    <TEXT>
    Document 13 - file: slide05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>slide04.jpg
    <TEXT>
    Document 14 - file: slide04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>slide03.jpg
    <TEXT>
    Document 15 - file: slide03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>slide02.jpg
    <TEXT>
    Document 16 - file: slide02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>slide01.jpg
    <TEXT>
    Document 17 - file: slide01.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>