The head of the river is a network of about 10 unnamed streams which rise on either side of the border between the parishes of St Mary and Portland in a district called Cocoa Wood. The highest of these reaches to just over on the east flank of Telegraph Mountain, a spur on the north of the Grand Ridge of the Blue Mountains, which is the site of a secondary triangulation station. From here the river flows essentially northwards until it reaches the Caribbean Sea just west of the Golden Grove Estate. Along the way it passes a number of small settlements and named regions including :
Perrys Tavern Gap
Warminister
Mount Joseph
Evandale
Happy Hut
Two Paths
Timsberry
Enfield
Juno Pen Village
Fort Stewart
Gradient
From its source at just over the Dry River falls to the contour just below Timsberry bridge in a little over , an average gradient of about 1 in 9. For this part of its course it has the character of a swift moving mountain river with numerous small waterfalls and rapids. Below the contour its character changes as it enters a relatively flat valley and slows, taking about to fall the final to sea level at its mouth, an average gradient of about 1 in 118.
Infrastructure
Working downstream from south to north, the first bridge is at Timsberry where the river crosses from east to west under an unclassified road. The second is a little south of Enfield where it crosses back. The final two bridges come just before the river enters the sea; here it crosses from south to north first under a road bridge carrying the A4 from Kingston to Annotto Bay and then under a railway bridge carrying the now defunct. The 1966 Directorate of Overseas Surveys 1:50,000 map shows the final two bridges as a single, combined road and rail bridge. There were a number of these along this coast, many built when the railway was first constructed in the mid-1890s, so it is quite possible that it was replaced at some point after 1966 but prior to the railways closure in 1978.
Tributaries
Most of the tributaries of the Dry River are short and appear to be unnamed. Working upstream from north to south there are:
The May River on the west or right bank, which joins immediately below the Timsberry road bridge.
Two unnamed on the east or left bank.
Three unnamed on the west or right bank.
One unnamed on the east or left bank.
One unnamed on the west or right bank.
Dry River elsewhere in Jamaica
There are several other uses of the name Dry River in Jamaica, all being minor tributaries. They are located in the parishes of Clarendon, St Andrew and St Thomas.
