  We have conducted an automated search for galaxy clusters within a contiguous
16 square degree I-band survey in the north Galactic hemisphere. A matched
filter detection algorithm identifies 444 cluster candidates in the range 0.2
<= z <= 1.2. The full catalog is presented along with the results from a
follow-up spectroscopic survey. The estimated redshift distribution of the
cluster candidates is consistent with a constant comoving density over the
range 0.2 <= z_est <= 0.8. A decline in the cluster space density by more than
a factor of 3 over this redshift range is rejected at >99.9% confidence level.
We find that the space density of Lambda_CL >= 40 clusters in our survey lies
in the range (1.6 - 1.8) x 10^{-5} h_{75}^{3} Mpc^{-3}, ~1.5 times higher than
the local distribution of comparably rich Abell RC >= 0 clusters. The Lambda_CL
distribution is consistent with a power-law. The discrepancy between the space
density of Abell clusters and the clusters in this survey declines quickly as
Lambda_CL increases, suggesting that the difference at lower richness is due to
significant incompleteness in the Abell catalog. A percolation analysis reveals
that 10 - 20% of the spectroscopically confirmed distant clusters are linked
into superclusters at overdensities between 10 < {\delta\rho \over \rho} < 50,
similar to what is seen in the local cluster distribution. This suggests that
there has been little evolution of the cluster-cluster correlation length for z
<= 0.5.
