Do you like Bald cypress? I love their roots.

sycamore

black gum

river birch

Trees that grow in wet soils: https://hortnews.extension.iastate.edu/faq/which-trees-grow-well-wet-soils

You do not say the size of your yard. One tree that is fast growing, and because of the color can add interest to your your is a willow tree. I always like the contrast between say pine and willow.

It has a bad reputation but, in the right place can be a benefit in filling an opening in your landscape.

We had one for years, and it could be control, with a yearly hair cut.

get run off during rain and can be wet for a few days.

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imo.. this is not significant enough water to force tree choice ... unless you tell us it happens weekly.. and the water barely ever dries ... would anyone call the area boggy or soggy??? do you need swamper boots to walk thru it ???

z5 is about half the US.. and extremely divergent.. big city name.. are you in maine .. MO... CO..etc.. it matters.. does your ground freeze ...

your key is probably.. if the ash lived there.. anything similar will ..

plant you tree high. on a small berm.. so it can put it roots where it wants them.. and you should be all set.. regardless of tree choice..

btw.. is the soil clay complicating the drainage issue??

ken

NW Indiana. Ground freezes and we get snow. The area is probably damp 1/3 of the year and yes boots or mucky shoes are required for a good part of that. We could have a large tree in the area. There is another ash close to it that we are treating ourselves but anticipate its demise at some point. The new tree sould then be the only tree in this area.

Aesculus of some sort. If size isn't an issue, Aesculus flava. People tend to avoid them because they brown out if they don't get enough water, but this site sounds good.

I also have periodic inundation and have lost dozens of Ash trees. in addition to the many good suggestions above, also consider:

Dawn Redwood Metasquoia glyptostroboides)

Red maple (Acer rubrum)

or Silver maple (Acer saccharinum)

The maples were already present for me. I have planted these species in my once-woody acreage:

Aesculus flava (yellow buckeye)

Betula nigra (river birch)

Metasequoia noted above

Nyssa sylvatica (blackgum)

I am still mulling over other options :)

How big a tree do you want? Do you care if it's deciduous or evergreen? How fast do you want it to grow?

@Sigrid Do you mean it helped the area not be as wet?

@charles kidder Would prefer not evergreen as we don't have ground space for a large base but have "air" space if that makes sense because of the terrain. Would also prefer a mid to large sized tree since this will eventually be the only tree in this area and it helps to hide 2 sheds

Betula papyrifera (paper birch) that grows in my neck of the woods, was always where the soil was consistently moist to wet, and many times grew along the edges of wet swampy areas that had water standing year-round.

No one said Metasequoia yet! One should fit anyplace a fraxinus did, right?

Metasequoia grows well in Missouri and Ohio so I suppose Indiana would be fine.

https://woostergeologists.scotblogs.wooster.edu/2020/07/09/new-paper-on-the-dawn-redwood-metasequoia-trees-of-wooster-ohio/

Toro, I said it 8 hours ago! And mine is perfectly happy in z5 Indiana clay With periodic inundation. Have had it since 2016 and it is lovely!

The only problem with Metasequoia in Zone 5 is they are prone to cold damage if you get early heat, they leaf out and then get frozen by late frosts in Zone 5. So, they tend to be safer in more coastal areas. And here, zone 7a/b NJ, new, tender foliage has also been charred by premature heat in April for me. I would still suggest you try one, they grow VERY, VERY, VERY FAST!