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There is a public right of way which runs along the top of the dam towards Little Tring.
While there is a spillway, the water level is controlled by underground pipes and the spillway rarely, if every, carries water.

Tringford Reservoir is one of four large reservoirs built to supply water to the Grand Junction Canal (now the Grand Union Canal) at the highest point on the canal between London and the Midlands. It was built in 1816 and the associated pumping station (which is still in use) was built in 1818.
In addition to its use to supply water to the canal it is also a private fishery and for many years it was used as a duck shoot. The adjoining land has become woodland and there is a bird hide. Together with the adjoining reservoirs it is a biological site of special scientific interest and for information on the wildlife visit the Friends of Tring Reservoir site Link