Mill Number List

Qualified graders at WWPA mills are authorized to use officials grade stamps issued by WWPA. Each mill is assigned a mill number, which is included only on stamps authorized to be used by the mill. 

The following mills are authorized by the Association to use WWPA grade stamps:

As of September 9, 2014 

10   Collins Companies, Chester, CA
17   Hampton Lumber Mills-Cowlitz Div., Morton, WA
18   Hampton Lumber Mills-Cowlitz Div., Randle, WA
19   Hampton Lumber Mills-Darrington Div., Darrington, WA
28   Collins Companies-Upper Columbia Mill, Boardman, OR
32   Stimson Lumber Company, Plummer, ID
34   Warm Springs Forest Products Ind., Warm Springs, OR 
35   Legacy Lumber, Loon Lake, WA
38   Simpson Lumber Company LLC, Tacoma, WA
43   S K Fingerjoint, LLC, Libby, MT  
47   Boise Cascade Company, LaGrande, OR
50   Idaho Forest Group, LLC, Athol, ID
53   Potlatch Corporation, St. Maries, ID
63   Simpson Lumber Company LLC, Longview, WA
65   Sierra Pacific Industries, Sonora, CA
68   Teal-Jones Lumber Services, Sumas, WA 
69   Collins Companies, Lakeview, OR
70   Sierra Pacific Industries, Centralia, WA
71   Idaho Forest Group, LLC, Moyie Springs, ID
84   Georgia-Pacific Wood Products Northwest LLC., Coos Bay, OR    
87   Malheur Lumber Company, John Day, OR
Georgia-Pacific Wood Products Northwest LLC., Philomath, OR
91   Sierra Pacific Industries, Burney, CA
92   Idaho Forest Group, LLC, Grangeville, ID
94   Sierra Pacific Industries, Aberdeen, WA
97   Zosel Lumber Company, Oroville, WA
98   Sierra Pacific Industries, Mt. Vernon, WA
99   Idaho Forest Group, LLC, Lewiston, ID
104  Boise Cascade Company, Pilot Rock, OR
115  Interfor U.S. Inc., Port Angeles, WA
116  Hills Products Group, Spearfish, SD
121  I
nterfor U.S. Inc., Gilchrist, OR
123  I
nterfor U.S. Inc., Molalla, OR
128  Stimson Lumber Company, Clatskanie, OR
129  F. H. Stoltze Land & Lumber Co., Columbia Falls, MT
134  Stimson Lumber Company, Priest River, ID
144  Columbia Vista Corporation, Vancouver, WA
146  Boise Cascade, LLC, Kettle Falls, WA
149  Yakama Forest Products, White Swan, WA
150  C & D Lumber Company, Riddle, OR
152  Tillamook Lumber Company, Tillamook, OR
153  Sun Mountain Lumber, Deer Lodge, MT
157  Rushmore Forest Products, Inc., Hill City, SD
162  Seneca Noti LLC, Noti OR
167  Stimson Tillamook, Tillamook, OR
169  Swanson Group Manufacturing, Roseburg, OR
177  Swanson Group Manufacturing, Glendale, OR
183  Sierra Forest Products, Terra Bella, CA
202  Sierra Pacific Industries, Lincoln, CA
214  Mid Columbia Lumber Products, LLC, Madras, OR
215  Mid-Columbia Lumber Products, LLC, Culver, OR
218  Guy Bennett Lumber Company, Clarkston, WA
223  Reidhead Bros Lumber Mills Inc., Nutrioso, AZ 
226  Stimson Lumber Company, St. Maries, ID
234  Warrenton Lumber Company, Warrenton, OR
236  Sierra Pacific Industries, Anderson, CA 
237  Blue Mtn. Lumber Products LLC, Pendleton, OR
241  Pyramid Mountain Lumber, Inc., Seeley Lake, MT

257  Spearfish Forest Products, Inc. Spearfish, SD
260  WMATCO, LLC, Whiteriver, AZ
261  Plum Creek Manufacturing, Inc., Kalispell, MT  
262  Unity Forest Products, Yuba City, CA
283  Boise Cascade, Elgin, OR
287  Boise Cascade, LLC, Homedale, ID  
293  Sierra Pacific Industries, Corning, CA
302  SDS Lumber Company, Bingen, WA
303  Simpson Lumber Company LLC, Shelton, WA

330  T & T Forest Products, New Plymouth, ID
338  Stimson Lumber Company, Gaston, OR
343  Vaagen Brothers Lumber, Inc., Colville, WA
349  Canyon Lumber Company, Inc., Everett, WA
357  Devil's Tower Forest Products, Hulett, WY
358  Bennett Lumber Products, Inc., Princeton, ID
365  Northland Wood Products, Inc., Fairbanks, AK 
369  Fox Companies, Laurel, MT
385  Sierra Pacific Industries, Shasta Lake City, CA
386  Sturgis Sawmill, Sturgis, SD
387  Sierra Pacific Industries, Quincy, CA
388  Seattle-Tacoma Box Company, Kent, WA

408  Willamina Lumber Company, Willamina, OR 
415  Thompson River Lbr. Co. of Montana, Thompson Falls, MT 
422  Plum Creek Manufacturing, L.P., Columbia Falls, MT 
426  Idaho Forest Group, LLC, Laclede, ID
435  Siskiyou Forest Products, Anderson, CA
457  Montrose Forest Products, LLC, Montrose, CO
461  Sierra Pacific Industries, Oroville, CA
468  Port Angeles Hardwood, LLC, Port Angeles, WA
515  Sierra Pacific Ind., Arcata, CA 


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