Thanks for the interesting information about the
geology of St. Paul! I've heard there are a lot of
interesting old tunnels in St. Paul.
Doug
--- pethier@comcast.net wrote:
>
> I have mentioned that Saint Paul is a river-bluff
> town. Our city datum for
> elevations is USGS sea level minus 694.10 feet.
> This is based on some
> point at some steamboat landing circa 1850. I'm in
> an office downtown in a
> building on top of a bluff. The city datum at the
> front door is about 95
> feet. A nearby storm sewer is essentially down to
> river level, so the
> dropshafts here are about 90 feet deep. The
> 150-foot-deep tunnels are out
> in the Midway district, carrying storm water to
> outfalls in the Mississippi
> on the west edge of town.
>
> There are also some deep sanitary-interceptor
> tunnels. The metro-wide
> treatment plant is located in Saint Paul, so
> sanitary flows are conveyed by
> a combination of tunnels and conventional pipes from
> other cities such as
> Minneapolis through Saint Paul to the plant.
> ============
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