According to Wildflowers of the United States:

Iris pseudacorus – Yellow Flag Iris, Paleyellow Iris, Yellow Iris, Water Flag. Iris pseudacorus is a species brought in from Europe as a decorative plant for its attractive yellow flowers, escaped, and has established itself well in wet areas throughout much of North America. Think cattails for the habitat in which it grows. It has been used as a plant in natural sewage treatment since it can remove metals from waste water. Its propagation is restricted as an invasive weed in a number of states ranging from Massachusetts to Washington and California.

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The lovely flowers of Yellow Iris are large and showy. This is the only yellow Iris in the United States.

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…typical Iris pseudacorus habitat – the edge of ponds, marshes, and other waterways. Although it prefers wet habitat, it is drought tolerant and the roots can survive for months without water. Yellow Flag will grow in dense clumps, spreading vegetatively by rhizomes and sexually via seeds. Both the leaves and the flowering stalk can be up to 4 feet tall.

Taken with a Sony RX-100 M3.