Risk Register - It will contain account of potential risks with detailed description, their probability of occurance, strategy of mitigation, probable impact on the project success and ownership.
Budget - It will have financials about the contracts, procurements, wages, transportation, taxes and so on, and will be handy when an information is to be retrieved or analysed
Regarding Risk Register and Budget, please identify the top 3 risks envisioned, and how much do you see this project of construction of a bridge over the region's costing?