Lam Brook is mentioned in an Anglo-Saxon charter as forming part of the boundaries of the village of Charlcombe.
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Streams from a number of springs issuing from the southern end of the Cotswold Hills at Lansdown, Toghill and Cold Ashton in South Gloucestershire converge at Ashcombe Farm near Langridge and the Lam Brook then runs in a generally southerly direction past Ashcombe House and the villages of Upper Swainswick and Lower Swainswick.
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Every year a road in Charlcombe is closed for seven weeks in February and March to allow newts, frogs and toads to safely travel down the road to reach a lake in the Charlcombe valley on an unnamed tributary of the Lam Brook.
St Mary Magdalene's Church at Langridge in the parish of Charlcombe, Somerset, England dates from the 12th century and has been designated as a Grade I listed building.