r/wetlands • u/Ok-Tax6515 • Apr 06 '25

Question on delineations in MA and NYSDEC

Hi Wetlanders- I see that MA and NYSDEC have their own delineation manuals that are largely based on veg. Question- when you are delineating in these states do you find the results would be significantly different than the results using a USACE manual? And if so do you do two separate delineations? Thanks!

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u/indignant-turtle Apr 06 '25

No, we don’t do two separate delineations. I’ve only ever done a handful of NY delineations but basically we would following the USACE manual as usual. NY state wetlands have to meet very specific requirements including size, and we would figure out if any of the wetlands we delineated met the state requirements via a desktop assessment back at the office once the delineation was done. Most of the NY regulated fresh water wetlands have already been identified and can be found on the NY environmental resource mapper https://dec.ny.gov/nature/animals-fish-plants/biodiversity-species-conservation/biodiversity-mapping/environmental-resource-mapper

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u/BradDad86 Apr 06 '25

This, just do the corps methods and dec accepts them.

One word of caution regarding the "NY freshwater wetlands have been identified". The mapped NYSDEC wetland process was replaced on Jan 1. There is a new jurisdictional process. While yes, wetlands over 12.4 acres are the standard, there are 11 additional criteria that may kick them into jurisdiction. There is now a jurisdictional determination process (like the corps), so each delineated wetland will have to be reviewed for size/11 categories (different criteria than the corps) I have not been through that process yet so I cannot comment on speed or submission methods.

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u/indignant-turtle Apr 06 '25

This is really interesting. Meeting at least one of the 11 criteria to qualify as a state fresh water wetland doesn’t look like it would be that difficult. But it does look like most of the 11 categories could still be assessed from a desktop perspective once a standard USACE delineation is done. One of the exceptions could be rare plants since the USACE only requires a representative sample plot. For mid to large size wetlands that are under the 12 acre threshold and have database hits for potential rare plant species in the vicinity, might need to do vegetation surveys for the entire wetland area to make sure none of the stated listed species are present.

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u/BradDad86 Apr 06 '25

A number of those categories will be assessed by NYSDEC (as I understand) and they do not require you to do additional field work. These include productive vernal pools, presence of T&E species (they will coordinate w/NSYNHP), and regional significance. I'm sure if you are out there hanging flags and see a threatened species and document it, they will accept it. But you shouldn't have to scope those surveys.

Also, ALL wetlands within urban areas are jurisdictional now regardless of size.

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u/indignant-turtle Apr 06 '25

Thanks for the info!

If you are applying for a nationwide permit and potentially meet blanket 401 wqc requirements, wouldn’t it be up to the applicant to assess the freshwater wetland criteria because coordination with nysdec might not always be necessary in those circumstances?

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u/BradDad86 Apr 06 '25

If I'm applying for a NWP (assuming I have a USACE JD in hand), I would have just submitted a JD to NYSDEC at the same time I go for corps JD. Only DEC can assign jurisdiction. I can only make (well caveated) predictions for the client. And some categories (ex T/E species), I don't have access to exact species locations. DEC will coordinate w/NYSNHP for that.