Here you will find the latest waterlevels if the NVE is providing the correct information.
Because the NVE website is not the most reliable, i am just as reliable as they are :)
I use a technique that is called "scraping" to collect the waterlevel values from their site.
unfortunatelly they do not provide a data exchange interface ( i have asked ).
Any way, i want to thank NVE for their data, you find their page here
Please note that this is a preview. It uses live data though!