I am not positive that is Phragmites australis and not our native species. The invasive one is a wetland species, as this article illustrates. But if you are concerned, by all means take a sample to your local conservation officer. It could be on your beach if it is a marshy beach area. I have seen it establishing in some wetter areas in public parks along the Lake MI coast which I am more familiar with.

Here is a link for all the places it has been found in MI. You can check for your county. https://www.michiganflora.net/species.aspx?id=2184

From that page: (A lot of botanist talk. Best to contact an expert unless you want to become a grass morphology weenie . . . And if so I suggest you get a powerful hand lens!)

"Marshes, wet shores, ditches and swales, tamarack swamps, fens; often
in water (sometimes as deep as 1.8 m); the Eurasian subspecies is now a
common invader of roadsides, ditches, and also native wetlands and lake
shores.

A cosmopolitan species, found around the world, represented in Michigan by two subspecies. The native subsp. americanus
Saltonst., P. M. Peterson & Soreng has shiny, reddish to purplish
lower stem internodes (usually exposed because the sheaths are readily
deciduous), and the membranous part of the ligule (excluding the apical
fringe) ca. 0.4–1 mm long. The introduced subsp. australis has
duller yellow or yellowish-brown lower stem internodes, the sheaths
mostly persistent after the culm senesces, and the membranous part of
the ligule 0.1–0.4 mm long. Though showing some overlap, glume length
also differs with the lower glume of the alien subspecies mostly 2.6–4.2
(–4.8) mm long while the native has lower glumes usually 4–7 mm long.

The native subspecies occurs throughout Michigan, while the
introduced subspecies, first collected in Michigan in 1979, is
concentrated in developed areas of southern Michigan, becoming less
common northward and apparently still uncommon in the Upper Peninsula.
McNabb & Batterson (1991) noted the spread of this entity, before it
was known that there were two subspecies in Michigan, and suggested
that it started to occur along roadsides about 1975. Though still much
undercollected, as of 2015, the alien subspecies was documented by
herbarium specimens from Delta, Iron, Kalamazoo, Lapeer, Mason,
Mecosta, Ontonagon, Tuscola, Washtenaw, and Wayne Cos.

The two subspecies differ in growth form; the native subsp. americanus often has rather scattered stems in a colony, whereas the introduced subsp. australis
generally forms very dense stands, choking out most other species. The
introduced subspecies is aggressively invasive and frequent now in
ditches, urban wetlands, and other disturbed, often saline, habitats,
though it is also a major problem on Great Lakes shoreline wetlands. The
native subspecies occurs in natural communities; fens, sedge meadows,
lake and river shores, etc. Catling, Mitrow, & Black (2007) provide
very helpful commentary on this species in eastern Ontario, including
more detailed discussion of characters. The two are amply distinct in
Michigan, but apparently the morphological gap is bridged by other
entities to our south. Vegetative reproduction can be very rapid in both
subspecies, with aggressive rhizomes, and also long stolons, the latter
noted as long as 13 m, as observed by L. H. Harvey on the flats at
Cecil Bay, Emmet Co. Both entities can have red color on the stolons."

The attached links have extensive suggestions on how to control it.

https://www.watershedcouncil.org/phragmites.html

https://nas.er.usgs.gov/queries/greatLakes/FactSheet.aspx?SpeciesID=2937&Potential=N&Type=0&HUCNumber=DGreatLakes

Note: Not the kind of thing you can do from a narrow perspective single photo.

Distinguishing Between Native and Non-native Phragmites australis:

Many morphological characteristics can be used to distinguish native Phragmites australis subsp. americanus from the introduced lineage Phragmites australis subsp. australis.
However, there are many overlaps in characteristics making it necessary
to look at multiple factors when making a determination based on
morphology. The following characteristics should NOT be used to
distinguish populations in southern areas (California to the Gulf of
Mexico) where the Gulf coast type may be present as it is very similar
in appearance to the introduced lineage (Swearingen and Saltonstall
2010).

Growth Forms:

Introduced Phragmites australis subsp. australis typically forms denser stands than the native Phragmites australis subsp. americanus,
the introduced subspecies stands are also more likely to include dead
stems from the previous year’s growth (MNFI 2016, Swearingen and
Saltonstall 2010). Introduced Phragmites is more likely to form monocultures, outcompeting and excluding other plant species. The native Phragmites,
is much less robust, typically occurring in low density stands, and is
frequently found with other native plants but it can occasionally occur
in very dense stands more typical of the introduced form when enriched
with nutrients (MNFI 2016, Swearingen and Saltonstall 2010).

Leaves:

Leaves of the invasive subspecies are a bluish gray-green, while
those of the native lineage are typically a lighter yellow-green (MNFI
2016, Swearingen and Saltonstall 2010). This is easiest to see when they
grow side-by-side (MNFI 2016).

Leaf Sheaths:

The leaf sheaths of the introduced Phragmites
adhere more tightly to the culm and persist as long as it remains
standing, whereas those of the native lineage adhere less tightly and
peel back eventually dropping off the culm once the leaf dies
particularly at the lower nodes exposing the stem below (MNFI 2016,
Swearingen and Saltonstall 2010).

Culms and Rhizomes:

Culms of the introduced lineage are rigid and have a rougher texture
than the native, which is usually smooth and shiny (MNFI 2016). Culms of
the native lineage are more likely to be red, typically around the
nodes and where the leaf sheaths have been lost. Whereas the culms of
the non-native lineage are usually a dull tan color (MNFI 2016).
However, non-native Phragmites has stolons that can grow up to
50 feet or more in a season and may be red, also a little red may
occasionally be seen on the culms of the introduced lineage but it is
usually limited to lower nodes, which may lead to confusion (MNFI 2016,
Swearingen and Saltonstall 2010). Little black spots are sometimes found
on the culms of the native lineage, which are caused by a native fungus
that has not yet adapted to the introduced form (Swearingen and
Saltonstall 2010). The culms of the introduced form may have a sooty
like mildew but it does not have the distinctive black fungal spots
(Swearingen and Saltonstall 2010). Rhizomes of the native subspecies
rarely exceed 15 mm in diameter and are a darker yellow than the
introduced lineage (Swearingen and Saltonstall 2010).

Ligules:

The ligule of the introduced lineage is typically less than 1 mm
(0.4-0.9 mm) in length. Ligules of the native are more than 1 mm (1-1.7
mm) (Swearingen and Saltonstall 2010). The native Phragmites is less sturdy and therefore its ligule is more likely to shred and fray by midsummer (MNFI 2016).

Glumes:

For the introduced lineage, the upper glume ranges in size from
4.5-7.5 mm, with most being <6 mm and the lower glume ranges in size
from 2.5-5.0 mm, most being <4 mm; the native subspecies has an upper
glume ranges in size from 5.5-11.5 mm, with most being >6 mm and
lower glume is ranges in size from 3.5-6.5 mm, with most being >4 mm
(Swearingen and Saltonstall 2010).

Habitats:

Introduced Phragmites
is typically found in ditches, disturbed sites, and can tolerate saline
habitats. In the Great Lakes basin, it is frequently found on
shorelines (MNFI 2016). The native lineage is usually found in fens,
sedge meadow, river banks and shores, and the Great Lake shores (MNFI
2016).

Growing Seasons:

Introduced Phragmites begins growing earlier in the season and continues later in the fall than does the native lineage (MNFI 2016).

Size: 2 to 6 meters in height

Distribution
in Michigan is largely coastal with populations concentrated in the
southeast and southwest corners of the state. It dominates the Saginaw
Bay region, the St. Clair Delta, and to a lesser extent, in the northern
tip of the lower peninsula and the eastern end of the upper peninsula
(MNFI 2016).

Table 1. Great Lakes region
nonindigenous occurrences, the earliest and latest observations in each
state/province, and the tally and names of HUCs
with observations†. Names and dates are hyperlinked to their relevant
specimen records. The list of references for all nonindigenous
occurrences of Phragmites australis australis are found here.

Au Gres-Rifle; Au Sable; Betsie-Platte; Betsy-Chocolay; Black-Macatawa; Black-Presque Isle; Boardman-Charlevoix; Brule; Carp-Pine; Cheboygan; Clinton; Detroit; Escanaba; Flint; Huron; Kalamazoo; Kawkawlin-Pine; Keweenaw Peninsula; Lower Grand; Muskegon; Pigeon-Wiscoggin; Raisin; Shiawassee; St. Clair; St. Joseph; St. Marys; Tacoosh-Whitefish; Tahquamenon; Thornapple; Thunder Bay; Upper Grand