Gryme's Dyke provides the outermost (western) dyke of the dykes system on the west side of Colchester, c.400m to the west of Shrub End Dyke (MCC7467)/the Triple Dyke (MCC7041). It comprises a ditch and bank (bank on eastern/inner side) aligned N to S and defined for c.5.5km from the River Colne southwards to the Roman River. The south part of the Dyke, c.2.1km long, kinks out and westwards (290m) at Stanway Green (Gryme's Dyke South). Gryme's Dyke has a terminus post quem of c.AD 47 and it is, therefore, clearly post-quest in date.

Roman and later features recorded during the excavations at Culver Street between 1981-2 and 1984-5.

Survival of the Boudiccan destruction horizon at 32.64m OD, recorded at 29-39 High Street in 1998.

Early Colonia building (CAT Building 9), burnt and destroyed during revolt of AD 60-61, recorded during the major excavations, 1971-4.

Berechurch Dyke, aligned approx. NNE to SSW from the western end of Barnhall Dyke (S. of Colchester Cemetery) to the Roman River Colne for c.3km. South of Berechurch Hall Camp, the dyke turns NNW to SSE, for c.560m, before turning N to S for a further 560m to the Roman River. In 2016, the dyke was also encountered c.1km to the north, within the area of the former Meeanee & Hyderabad Barracks.

Early Colonia timber-framed building (CAT Building 8) set out around gravel yard, burnt and destroyed during revolt of AD 60-61, recorded during the major excavations, 1971-4.

The Town Wall was intially constructed free standing at an early date following the Boudican revolt, although the exact date is open to interpretation. Six gates were built into the wall, including the Balkerne Gate (MCC555) on the west side - the main gate - which incorporated a free-standing monumental arch (MCC718), as well as a series of rectangular towers and tile drains at the end of streets. An interior rampart was added in the late 2nd century AD and, at some point, a V-shaped defensive ditch was cut around the outer foot of the wall. This was modified in the late 3rd century, and two of the town gates were closed off. Major repairs were carried out in 1173-4. During the Middle Ages there were four main gates (along with two or three pedestrian gates) into the walled town, with the main gate on the south side near the south-west corner, Head Gate. A programme of repairs was initiated between c.1381-1413, including the addition of eight bastions on the south-east circuit (four survive above ground). Beside the four principal gates, there were two sherde (pedestrian) gates, on the north and south sides of the circuit, and another on the west side; no medieval gate structures survive above ground. The town wall and its gates suffered significant damage during the 1648 Siege.

The main west gate of the Roman colonia. A freestanding monumental arch (MCC718), probably constructed when the colonia was founded in AD 49, was incorporated into a larger gateway when the wall (MCC859) was added to the refounded colonia following the Boudican revolt (although the date of the wall is subject to interpretation). The surviving (south) pedestrian archway, and the southern guardroom, is only a small part of what was a massive entranceway (30m long N to S) into Roman Colchester from the west. Most of the gate was demolished, and the gap filled in, c.AD 300.