The phrase "clean river" is grammatically correct and can be used in written English.
Example: The town's main attraction is its clean river, which is perfect for swimming and fishing.
Unlike the mosquito, it breeds in clean river water.
Look at what the Ganges — not a clean river — means to the Indian city of Varanasi.
Shenzhen was nothing but a sleepy village of 20,000 fishermen alongside a clean river.
A clean river flows through her backyard, and the soil is rich.
The Obama administration cannot let G.E. block the best hope for a clean river in our lifetime.
The European Union has imposed large fines on Paris for breaching EU norms for clean river water.
"Clean air, safe drinking water, cleaning up toxic sites, clean rivers and streams – that's all essential for a strong economy".
Several lines from "Relatively Clean Rivers" seem to have held special meaning for him.
The beliefs expressed in "Relatively Clean Rivers" were not all personal.
Although salmon are lovely, so too are pristine forests, healthy mountain streams, clean rivers for drinking water and recreation.
