Editing River Cam (section)

==From Jesus Lock and the Backs to Grantchester (middle and upper river)==
[[File:KingsCollegeChapelWest.jpg|thumb|left|[[The Backs]] in Cambridge: [[King's College Chapel]] (centre) and [[Clare College, Cambridge|Clare College]] (left)]]
The stretch above Jesus Lock is sometimes known as the middle river (with the section above the Mill Pond being referred to as the upper river).<ref>{{cite web |url=http://www.camconservators.co.uk/notices.asp |title=Cam conservancy notices |access-date=20 September 2008 |url-status=live |archive-url=https://web.archive.org/web/20081218171252/http://www.camconservators.co.uk/notices.asp |archive-date=18 December 2008 |df=dmy-all }}</ref> Between Jesus Lock and the Mill Pond,{{ref|map 12|map 12}} it passes through [[the Backs]]{{ref|map 10|map 10}} below the walls of many of [[List of colleges of the University of Cambridge|the colleges]]. This is the section of river most popular with tourists, with its picture-postcard views of elegant bridges, green lawns and graceful willows. This stretch also has the unusual feature of the remains of a [[Punt (boat)#The Cambridge towpath|submerged towpath]]: the riverside colleges did not permit [[Horse-drawn boat|barge horses]] on the Backs, so the beasts waded up the Cam to the mill pulling their loads behind them.

Access for mechanically powered boats is prohibited above 'La Mimosa' Pub (at the upstream end{{ref|map 8|map 8}} of [[Jesus Green]]{{ref|map 6|map 6}}) between 1 April and 30 September, when the middle and upper river are open only to manually propelled craft. The most common of these are the flat-bottomed [[punt (boat)|punt]]s.

Between 1 October and 31 March powered boats are allowed as far as Mill Pool, but few people take advantage of this, as there are very few public mooring places along the Backs, and the river is too narrow and the bridges too low to afford easy passing or turning for many boats.

[[File:Cam punt slipway.jpg|thumb|A punt being pulled up rollers on the slipway between the upper and lower levels of the River Cam near the Mill Pool.]]
Punts and canoes can be manhandled around the [[weir]] above the Mill Pool by means of the rollers, a slipway from lower to upper level. From the Mill Pool and its weir, the river can be followed upstream through Grantchester meadows to the village of [[Grantchester]]{{ref|map 14|map 14}} and Byron's Pool,{{ref|map 15|map 15}} where it is fed by many streams.