[Detector]

Monday 23rd Clue:
They come in many shapes and sizes.
A river/bridge

Tuesday 24th Clue:
Many are dirt, but some are paved
Dikes on the river are mostly dirt but some are paved

Wednesday 25th Clue:
The trail has many curves
The river has many curves and its more a trail than river now

Thursday 26th Clue:
Where the metal meets the road
The railroad bridge

Friday 27th Clue:
Most have many branches
The river has branches

Saturday 28th Clue:
When they turn they roar
Warning siren in/near the park?

Monday 30th Clue:
The high banks can be treacherous
The banks of the river have wire barricades