Sông Cầu Quang - A Story Young Ones Cannot Confirm

This place is my hometown. Near where I live (around 1 km away) is a river under the name Cầu Quang (literally Quang bridge, yes, Vietnamese are creative with names). You probably will find it hard to even google it as it is a fairly minor river. My mother and her friends do not mention it often but once a while, when the time comes to talk about the good old times, they mention it. It used to be so clear people could just drink straight out of the river. The river had fish and prawns and children trying to catch them (including her). Well, I truly find that hard to believe. Ever since I was conscious, every time I came close to that river, it made me block my nose because it stinks. I cannot estimate its depth because the water is a deep dark green. I do not see fish swimming, I see trash floating. I can somehow guess how that happens as I spot factories around town and the majority of Vietnamese people are quite careless and irresponsible with trash and disposal. Even though I can picture the event logically, I still find it hard to truly grasp it from my deep subconscious as the only Cầu Quang river I know is one so polluted you will get skin diseases swimming in. Yet, quite a number of people from my mother's generation who I get the chance to speak with tells of an unfamiliar river right there. It is improbable that many people have the same false memory so I will assume the clear river did exist at some point.