Capitalisation of waterways features 

Hi. Can you please point me to the WP:MOS page that says all individual bridges, tunnels, locks, etc must be described in lower case? As far as I am concerned, Basingstoke Canal and Foxton Locks are proper nouns and should be capitalised as such. It is correct to talk about "the locks at Foxton", and "the canal in Basingstoke", but using mixed capitalisation is misleading: Foxton locks suggests a type of lock known as 'Foxton'.  You could not correctly say a Bath deep lock, unless there was more than one of them: one would write 'the Bath Deep Lock. There is only one "Bath Deep Lock" so "Bath deep lock" is not an appropriate nomenclature, however Bath chair and Bath bun describe generic items and should not be capitalised.

Could you please double-check your reference for this format and apply the necessary corrections? Thank you.