This paper concerns the structure of strongly continuous one parameter semigroups of completely positive contractions of B(H) = B(K ⊗ L²(0,∞)) which are intertwined by translation. These are called CP-flows over K . Using Bhat's dilation result each unital CP-flow over K dilates to an E_o-semigroup of B(H₁) where H₁ can be considered to contain B(K ⊗ L²(0,∞)). Every spatial E_o-semigroup is cocycle conjugate to one dilated from a CP-flow. Each CP-flow is determined by its associated boundary weight map which determines the generalized boundary representation. The index of the E_o-semigroup dilated from a CP-flow is calculated. Machinery for determining whether two CP-flow dilate to cocycle conjugate E_o-semigroups is developed.