County Engineering Click Image to View County Roads to Scale Green Book & Addendum The “Green Book” is the original reference guide to the county documents. The “Addendum” provides further detailed information Introduction to the Green Book Green Book Green Book Addendum Various Engineering projects located in Hampden County Agawam Ct River Walk & Bike Trail (1996) Agawam Training School Hampden County Court Plans Hampden County Jails Mount Tom Reservation Hampshire & Hampden Canal Co (1829-1847)