Porter County

Porter County is three different pieces of ground stacked north to south, and a contractor who treats it as one county will be wrong two times out of three. The lakeshore at Portage and the dune towns is loose sand. The middle of the county, where Valparaiso sits, is the Valparaiso Moraine: real hills by Indiana standards, heavy clay, and close to three hundred feet of rise and fall between the beach and the high ground out on the LaPorte County line. The southern townships around Hebron and Kouts are the old Kankakee marsh, flat as a table, clean sand under a skin of muck. Same county, three different jobs, and the transitions are abrupt rather than gradual.

The moraine is the part people underestimate. The clay up there is Ozaukee, not the Morley that gets quoted for it, and it carries a dense layer starting somewhere between two and four feet down that holds water above itself. That is why moraine ground can look bone dry at the surface and be saturated a foot and a half in, and why a machine that walked in clean on Tuesday is buried on Thursday. Deeper still there are saturated sand and gravel bodies running through the till, and where the clay meets saturated sand the ground turns unstable in a cut, which the county soil survey flags in its own engineering tables. On anything deep, a full basement, a large retention pond, a footing that has to carry real load, the borings need to go well below the bottom of the planned hole rather than down to it. That is not caution for its own sake, it is the specific way jobs fail on this moraine.

North of the moraine the ground turns to sand and the rules invert. Along the lake through Portage, Porter, Chesterton and the dune towns the material runs better than ninety percent sand, which digs easily and stands not at all. Trench walls there are a shoring question at any depth, never a judgment call. Ponds are the other surprise, because that sand will not hold water on its own: a pond up there is either dug down to meet the water table or built with a clay key brought in. And two hundred feet from a sand ridge you can be standing on sixteen to fifty inches of muck over sand in an old interdunal swale with water sitting at the surface, and in the closed bogs off those swales it runs deeper still. That is a third job again on the same property.

South of the divide the county flattens onto the Kankakee plain, and the flats along the southern edge have roughly forty feet of fall across the entire belt. Nothing down there drains by accident. Every bit of it was ditched and tiled in the early nineteen hundreds and it has been maintained by machine ever since. The ground is a veneer of muck over clean sand, so a pad or a footing means undercutting the organic material and building back in compacted lifts, and dewatering is the working assumption rather than the exception. There is also undocumented field tile through most of it, and cutting one is a legal problem as much as a hydraulic one.

Two things worth knowing before any drainage work here. The county surveyor maintains a regulated drain network measuring better than three hundred and eighty miles across eighty-five named drains, and Indiana law gives the county right of entry within seventy-five feet of the top of each bank of an open drain, which is a corridor better than a hundred and fifty feet wide, or seventy-five feet either side of the center line of a tile. The board can narrow that on newer and urban drains, which is worth checking rather than assuming. Either way, a rural Porter County job has good odds of touching that easement. We plan around the surveyor's office rather than discovering it in week three. The second is a piece of geography that turns out to matter: the divide runs a couple of miles south of Valparaiso, so water at the city goes north to Lake Michigan by way of Salt Creek, the east arm of the Little Calumet and the Portage-Burns Waterway, while ground a few miles down the road is headed for the Kankakee and eventually the Gulf. Which direction your water leaves decides how much fall you have and who has a say in it.

Porter County went live because the searches and the calls came out of this corner of the state on their own, not because we drew it on a map first. We are not going to pretend we have a crew parked in Valparaiso. What we have is a phone answered around the clock, a scope and a straight quote from us, and the network crew that fits the job working under our standard. Calls and searches out of this corner of the state have been arriving on their own, which is exactly how the map is supposed to grow.