Yeah, see, when the water sits as it does at that dam, other chemical reactions come into play. But as noted, in the upper parts, the water tends to be orange due to the acid dissolving iron compounds in the rocks. That color is present in many small streams in the Skook area, mitigated in one place along the Rausch Creek by limestone cairns. Maybe your local Trout Unlimited org can install a few of those along the waterways to mitigate the AMD.