Bishopton - June 1976. Castle Hill consists of a motte some 38ft high, surrounded by a ditch and outer bank, flanked by two lines of lower banks on the west and a single line on the east. The earthworks are complex and well-preserved with a bailey to the south which itself appears to be divided into inner and outer wards. A rectangular area on the north of the motte would also appear to have been enclosed by a bank. The whole motte and bailey is surrounded by a much larger area of low lying ground. Two causeways run across this area to the motte from the east and north-west. A stream to the west of the earth works would presumably have been used to flood this area should the occasion arise.
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