River Chelmer
| Chelmer | |
| River | |
 River Chelmer near Little Baddow
|
|
| Country | England |
|---|---|
| Region | Essex |
| Part of | River Blackwater |
| Tributaries | |
| - right | River Can |
| City | Chelmsford |
| Source | |
| - location | Hamperden End |
| - elevation | 117 m (384 ft) |
| - coordinates | 51°57′17″N 0°17′06″E / 51.9546°N 0.2850°E |
| Secondary source | |
| - location | Rowney Wood, near Debden |
| - elevation | 115 m (377 ft) |
| - coordinates | 51°58′42″N 0°17′29″E / 51.9784°N 0.2914°E |
| Mouth | River Blackwater |
| - location | near Maldon |
| - elevation | 0 m (0 ft) |
| - coordinates | 51°43′22″N 0°42′26″E / 51.7228°N 0.7073°ECoordinates: 51°43′22″N 0°42′26″E / 51.7228°N 0.7073°E |
| Length | 65 km (40 mi) |
The River Chelmer is a river that flows entirely through the county of Essex, England, running 65 kilometres (40 mi) from the north west of the county through Chelmsford to the River Blackwater near Maldon.
The source of the river is in the parish of Debden in north west Essex. The two primary source streams run to the north and to the west of the hamlet of Debden Green. The longer of the sources rises in the hill to the west of Debden Green, only a few hundred metres to the south east of the source of the River Cam that heads north through Cambridge eventually emptying into The Wash.
The River Chelmer flows past Thaxted, south through the district of Uttlesford around the northeast of Great Dunmow. It continues flowing south-southeast into the borough of Chelmsford and on into the city of Chelmsford where the River Can flows into it. It then flows east through the borough and into the district of Maldon until it meets the River Blackwater near Maldon. It discharges into the North Sea via the Blackwater Estuary.
The Chelmer and Blackwater Navigation Company was found by act of parliament in 1793. Work then commenced on constructing the navigation from Chelmsford to Colliers Reach in the tidal estuary of the River Blackwater. The work was completed in 1797. The navigation mainly followed the course of the River Chelmer from Chelmsford to Beeleigh near Maldon. From there it continued through a short cut and then followed the course of the River Blackwater to Heybridge.
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