I pulled this tab from a forum over at passingafternoon.com and cleaned it up a bit. 
to el nino for it. Strumming pattern is simple, just listen. Lyrics should be close.

Capo 1st fret
Tab relative to capo

--0-----0--------------------|
--2(/3)-0--------------------|
--2-----1--------------------|
--0-----2--------------------|
--2-----2--------------------|
--0-----0--------------------|


then

--2--0--2--0-----------------|
--2--2--3--0-----------------|
--2--2--4--1-----------------|
--4--2--4--2-----------------|
--4--0--2--2-----------------|
--2--------0-----------------|


Yonder come a glad man singing a song
bout soldier worn a boot and a fallen angel
naked as a fish at night
bout a sad man climbed up a willow bough
and the cops are on the fence round the dog in the manger
and the mouth of the river is wide..

Wide.. Wide..

Yonder come a glad man singing a song
bout the bushes by the gas pump gone to flower
and a constant star collides
bout a sad man saying they've forgotten how
and the baby quit sucking when the milk went sour
and the mouth of the river is wide

Wide.. Wide..
Woooo... Wooo...

Bout a sad man lost in the hammock sway
when the bridal gown came mama spit out the window
and the cops say the dog wont bite
and the sad man saying they've forgotten when
and the blood runnin black in the valley shadows
and the river running all the while

Yonder come a glad man singing a song
bout a lover rolled over said you must be tired
and the truth coming towards the light
bout a sad man knocking on a chapel door
and a burned out boat called "Trial by Fire"
and the mouth of the river is wide

Wide.. Wide...
Woooo... Wooo..