River Bed Guerilla Grow

I plan on growing a few plants in a river that runs through my town. Its a MASSIVE river bed, the river bed itself is probably 600yards wide and miles long, with year long water and pretty dense foliage. I know this place like the back of my hand. I plan on using 50/50 FFOFxHappyFrogxPerlite. I want to top dress with seabird guano every 2 weeks, and switch to bat guano towards flower. Will this be enough nutes, or is there other top dressing I could be adding?

Very interesting start.

Be careful with flooding.

I've done several river/creek side grows and yes they can be both productive and challenging. Since you are near a large river, it is likely that the soil is extremely rich. Silts, loams and other humus-rich organic materials have built up over the eons for a ideal soil profile. Some soils near rivers can be slightly mucky and provide poor drainage but this can be easily remedied with the addition of perlite. I would try to find a spot that faces south, well above the last known flood level with little or no competing vegetation. This may require cutting some surrounding vegetation but is easily maintained through the grow season. Plants should also be slightly raised to improve drainage. Put no more than 2 plants/location to avoid detection. Spread your grow areas several hundred feet apart if possible.
Since the soil is usually loaded with nutrients I wouldn't think that the addition of much nutrients are needed. A little should go a long way in this situation.

Also there are mineral water hot springs hidden all over this river bed, it smells like rotten eggs but it might be good for a plant? I know the locals swim in that shit for healing purposes.

Good luck, hope they turn out nice and big