culverts

WA-RD 687.1
Authors: 
David R. Thurman and Alex R. Horner-Devine
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Sunday, July 1, 2007
WA-RD 489.1
Authors: 
Peter H. Singleton, John F. Lehmkuhl.
Originator: 
Pacific Northwest Research Station (Portland, Or.). Wenatchee Forestry Sciences Lab.
Publication Date: 
Monday, May 15, 2000
WA-RD 545.1
Authors: 
Eirk Robert Rowland, Rollin H. Hotchkiss, Michael E. Barber.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Saturday, June 1, 2002
WA-RD 545.2
Authors: 
John F. Orsborn, Mack T. Orsborn.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Tuesday, October 1, 2002
WA-RD 614.1
Authors: 
W. Pearson, M. Richmond, G. Johnson, S. Sargeant, R. Mueller, V. Cullinan, Z. Deng, B. Dibrani, G. Guensch, C. May, L. O'Rourke, K. Sobocinski, H. Tritico.
Originator: 
Battelle Memorial Institute, Pacific Northwest Division.
Publication Date: 
Sunday, May 1, 2005
M 23-03
Originator: 
Design Office, Engineering and Regional Operations Division
Publication Date: 
Wednesday, March 1, 2006