[Geodata] River locks and waterfalls ?

[Chieko Maene]

I don't know if the data exists but I would ask either USGS hydrographic 
data team (http://nhd.usgs.gov/data.html) or NOAA Office of Coast Survey 
hydrographic data team (http://chartmaker.ncd.noaa.gov/hsd/hydrog.htm). 
Both takes questions via email or phone. I haven't used NOAA's ENC 
(Electronic Navigation Chart - in IHO S-57 format) nor RNC (Raster 
Navigational Charts - in NOAA BSB format), so I don't know exactly what 
NOAA has, but I know the agency and USGS collect much hydrographic 
features information. They may know the data source.. Chieko

Martin Spott wrote:
> Does anyone know a reliable (and precise) source of locations of
> river locks and waterfalls ?
> 
> FlightGear's Scenery creation tools currently put connected water
> bodies at the same elevation, therefore the whole GreatLakes area is
> being positioned at sea level ....  :-)
> This could be fixed if such barriers are known.
> 
> Cheers,
> 	Martin.