This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. Toward or near the mouth of a river; in the direction of the current: swam downriver; a downriver canoe race.

adj. Closer to the mouth of a river

ad. Travelling in the direction of the river current.

ad. away from the source or with the current

"EaglePass also has two bridges and again I would recommend Bridge II which is about 1/2 mile downriver from the old downtown bridge."

downstream   

Liver    deliver    giver    liver    quiver    river    shiver    sliver    upriver   

uptown    offworld    settle    affordeth