Editing New Bedford River (section)

==Course==
The New Bedford River follows a fairly straight course, heading approximately north-east for {{convert|20.8|mi|km}} from Earith to Denver Sluice. While there are no real restrictions on the length or width of boats, draught is limited to {{convert|2|ft|m|1}} and headroom to {{convert|7.8|ft|m}}, although the river is tidal, and so these values can fluctuate depending on the state of the tide.{{sfn |Cumberlidge |2009 |pp=229–230}} The Environment Agency advise that navigating up the river is best attempted when there is a tide of at least {{convert|24|ft|m}} at [[King's Lynn]], and boats should enter the river at Denver soon after the tide turns. Water levels tend to rise steeply for about two hours after the tide turns, and then drop gradually over the next ten hours.{{sfn |Holmes |2005 |p=86}} Care is needed to ensure that boats remain in the centre of the channel, particularly during the winter months when the river may be overflowing into the Ouse Washes.{{sfn |Holmes |2005 |p=87}} Despite being some {{convert|35|mi|km}} from the sea, water levels at Earith still rise and fall by about {{convert|2|ft|m|1}} on a spring tide, and by a few inches for a neap tide.{{sfn |Holmes |2005 |p=88}}

[[File:cmglee New Bedford River aerial.jpg|thumb|left|Aerial view of the New (middle diagonal grey line) and Old (right diagonal grey line) Bedford Rivers crossed by the Ely-March railway (bottom dark line)]]
The area between the two Bedford Rivers, {{convert|20|mi|km}} long and {{convert|1070|yd|m}} wide at their greatest separation near Welney,<ref>Measured using [[Google Earth]]</ref> is below the rivers and below sea level, and is frequently flooded during winter. There is a sluice at Earith which is used to control the waters of the River Great Ouse. It was built with nine openings in 1637, but was subsequently rebuilt with seven openings in 1824, and again with three openings in 1954. When flows in the upper river are normal, the sluice gates are closed, and most of the flow is routed along the tidal New Bedford River. As flows increase, the sluices are opened, and water flows along the Old Bedford River, which progressively floods the {{convert|8.9|sqmi|sqkm}} of [[washland]]s which comprise the [[Ouse Washes]].{{sfn |Blair |2006a |p=33}} At [[Welney]], these washes provide an ideal [[habitat (ecology)|habitat]] for [[wildfowl]] and other birds, and the [[Wildfowl and Wetlands Trust]] has established a [[nature reserve]] here, the [[WWT Welney]]. The reserve occupies {{convert|990|acre|ha}}, and is accessible from the A1101 bridge by following a minor road to the carpark, and then crossing the New Bedford River by a footbridge. It is important for its wild flowers, dragonflies and butterflies, as well as the birds, which are most numerous when the washland is flooded.{{sfn |Blair |2006b |p=39}}

There are public footpaths on both sides of the river for most of its length, the only exception being a short section of the western bank near Earith. A long-distance footpath called the [[Hereward Way]] crosses the river by the A1101 bridge at Welney, and then follows the eastern bank southwards almost to the [[March railway station|March]] to [[Ely railway station|Ely]] railway line. It turns to the east a little before the bridge, following the north bank of the Engine Basin, a drainage channel which is pumped into the river by the Hundred Foot Pumping Station.<ref>Ordnance Survey, 1:25,000 map</ref>
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