Morgan County

Morgan County sits on the line where the last ice sheet stopped, and you can see it in the ground. The north is flat till plain, wet and clay-heavy, the same country as Hendricks and Boone. The south rises into continuous ridge and hollow running toward the Brown County hills. Worth being accurate about it, because the easy version is wrong: the southern half is not unglaciated, older ice reached it long before the last advance. What actually changed is how deeply the ground has been cut. Northern uplands here reach nine hundred and thirty feet, same as the south, but they sit as broad flats between a few deep valleys, while the south is dissected the whole way across.

The numbers on the relief are real: about three hundred and ninety-four feet between the hills southeast of Martinsville and the point where the White River leaves the county at the southwest corner. That is more vertical than anywhere else we cover except LaPorte, and it is why the work here splits so cleanly. In the south, water leaves too fast and takes the property with it, so the jobs are erosion, gullies, washed lanes, crossings and slopes cut back to an angle that will hold seed. In the north, water does not leave at all, so the jobs are tile, grade and drainage.

Then there is the river, and it is not a footnote. The White River runs through Martinsville with a drainage area of better than two thousand four hundred square miles by the time it gets there, and the gage record is a flooding record: ninety thousand cubic feet per second in 1913, and it has come close again in 2003, 2005, 2008 and 2013. The single most extensive soil map unit in this entire county is Genesee silt loam, frequently flooded, and Shoals adds thousands more acres of the same. Grading in that bottom ground has to be flood-aware, and work in the floodway needs state approval on any stream draining more than a square mile, which covers the river and most of the named creeks here.

Now the thing that makes this county genuinely unusual, and it is the reason this page exists. Morgan County has seventy dams, which is second in the state of Indiana behind only Brown County. Sixty-two of them are earth embankments, sixty-four are recreation ponds, the median height is twenty-six feet, and the median year they were finished is 1965. Fifty-eight of the sixty-three with a recorded date were built before 1980. That is a very large population of private earth dams in one county, most of them older than the people who own them now, and earth dams do not age quietly.

What ages badly on them is predictable. The overflow pipe is usually first, because a pipe carried through a dam is the hardest part to build correctly and the easiest to neglect, and when it rusts or crushes it starts moving water through the structure instead of over it. Then the spillway, which undercuts and enlarges with every heavy rain until the dam is in real danger. Then seepage at the toe, trees whose roots die and leave a channel straight through the embankment, and burrowing animals. Every one of those is repairable if it is caught, and every one of them gets more expensive the longer it runs.

The soil survey is honest about how hard pond work is here, and it is worth knowing before anybody quotes you. Not one acre in this county rates favourable for holding a pond. The dominant limitation across better than two hundred and thirty thousand acres is seepage in the two to six foot zone, which means most sites need a compacted clay core or imported material to seal rather than sealing on their own. Embankment ground is limited too, mostly by a high water table in the north and by shallow bedrock in the south. Three soils here, Banlic, Bloomfield and Treaty, are specifically flagged for piping, which is the failure where water finds a path through the structure and quietly enlarges it.

So the two halves of the county give you opposite pond problems. The south gives you terrain, natural dam sites and real head, and takes it back with thin soil over siltstone and sandstone and steep abutments to tie into. The north gives you clay worth building with and takes it back with a water table that makes a poor foundation and a dug pond that seeps. Neither is a reason not to build. Both are reasons to test the ground before choosing where the pond goes, which costs very little next to a pond that will not hold.

The rest of the work follows the same north and south logic. Around Mooresville, Monrovia and Brooklyn it is till plain: field tile from single repairs to pattern runs, grassed waterways, regrades on lots that never drained, pads and lanes. Down through Paragon, Morgantown and the hill country it is slope work: erosion repair, culverts sized for what the ground above them actually delivers, drives cut into grade, and excavation that hits rock sooner than people expect. Along the river through Martinsville and Centerton it is bottomland, and the constraint is the floodway rather than the machine.

One practical note on drainage anywhere in the county. Work that touches a regulated drain brings the county surveyor in, and Indiana law gives right of entry seventy-five feet from each bank, so the corridor is wider than most people picture. We check that before quoting rather than after.