E. coli too excessive for swimming at 16 seashores, Iowa DNR monitoring says

Sixteen seashores usually are not beneficial for swimming, the identical quantity because the week of July 31, albeit with some seashores swapped round. That’s nonetheless the very best variety of seashores with harmful quantities of E. coli because the 2026 season began.

The Iowa DNR gives weekly updates on which state seashores are experiencing excessive ranges of E. coli or algae that may be harmful to swimmers. You can examine the latest reports on the DNR website or by calling 515-725-3434.

Staff acquire weekly samples at 41 state-owned swimming seashores to find out the general public’s danger of coming involved with waterborne ailments. Testing begins every week earlier than Memorial Day and runs via Labor Day.

What Iowa DNR seashores usually are not beneficial for swimming?

Backbone Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 5
• Test outcomes: Exceeded single-sample restrict and five-sample Geomean normal for E. coli

Beeds Lake Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 4
• Test outcomes: Exceeded single-sample restrict and five-sample Geomean normal for E. coli

Big Creek Beach

• Beach classification: Less weak
• Last take a look at date: Aug. 4
• Test outcomes: Exceeded five-sample Geomean normal for E. coli

Bobwhite State Park

• Beach classification: Not obtainable
• Last take a look at date: July 29
• Test outcomes: Exceeded single-sample restrict for E. coli

Clear Lake State Park Beach

• Beach classification: Less weak
• Last take a look at date: Aug. 4
• Test outcomes: Exceeded single-sample restrict and five-sample Geomean normal for E. coli

Denison Beach

• Beach classification: Less weak
• Last take a look at date: Aug. 4
• Test outcomes: Exceeded five-sample Geomean normal for E. coli

Emerson Bay Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 5
• Test outcomes: Exceeded five-sample Geomean normal for E. coli

George Wyth Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 5
• Test outcomes: Exceeded five-sample Geomean normal for E. coli

Lake Ahquabi Beach

• Beach classification: Less weak
• Last take a look at date: Aug. 5
• Test outcomes: Exceeded five-sample Geomean normal for E. coli

Lake Darling Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 4
• Test outcomes: Exceeded single-sample restrict and five-sample Geomean normal for E. coli

Lake Manawa Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 4
• Test outcomes: Exceeded single-sample restrict and five-sample Geomean normal for E. coli

McIntosh Woods Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 4
• Test outcomes: Exceeded single-sample restrict and five-sample Geomean normal for E. coli

Nine Eagles Beach

• Beach classification: Vulnerable
• Last take a look at date: July 29
• Test outcomes: Exceeded single-sample restrict and five-sample Geomean normal for E. coli

Pleasant Creek Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 5
• Test outcomes: Exceeded five-sample Geomean normal for E. coli

Prairie Rose Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 4
• Test outcomes: Exceeded single-sample restrict and five-sample Geomean normal for E. coli

Union Grove Beach

• Beach classification: Vulnerable
• Last take a look at date: Aug. 5
• Test outcomes: Exceeded single-sample restrict and five-sample Geomean normal for E. coli

What different seashores usually are not beneficial for swimming?

The Iowa DNR additionally tracks studies for 39 metropolis or county seashores throughout the state. This week, seven of the seashores reported E.coli ranges above the single-sample restrict.

In the Des Moines metro, the Blue Heron Lake in Raccoon River Park in West Des Moines has improved again to secure ranges. Gray’s Lake in Des Moines can also be OK to swim in.

Which Iowa seashores have improved to ‘OK for swimming’?

Two seashores have improved again onto the listing as “OK to swim” because the July 31 outcomes:

• Black Hawk Beach
• Crandalls Beach

Which Iowa seashores have particular statuses?

• Blue Lake Beach: While Lewis and Clark State Park has reopened, the seaside at Blue Lake Beach stays closed attributable to low water ranges. DNR is just not conducting testing whereas the seaside is closed.
• Brushy Creek Beach: Monitoring is at present suspended attributable to development.
• Lake Keomah: Monitoring by DNR is at present suspended attributable to low lake water circumstances. The DNR drained the lake in July 2024 for a serious renovation and water high quality enchancment mission that was set to final via spring 2026. The DNR warns folks to remain out of the lake mattress, which could look dry, however is comfortable and will shortly entrap folks.

How does the Iowa DNR classify Iowa’s seashores based mostly on their water high quality?

DNR officers classify state park seashores into one in every of three classes yearly based mostly on their historical past of micro organism outcomes in recent times:

• Vulnerable: Beaches are thought of weak when the geometric imply normal is exceeded in three or extra of the 5 most up-to-date sampling seasons.
• Transitional: The seaside’s geometric imply normal is exceeded in two or fewer sampling seasons of the 5 most up-to-date years of monitoring and was listed as “vulnerable” previously monitoring seasons.
• Less weak: The seaside’s geometric imply normal is exceeded in two or fewer sampling seasons of the 5 most up-to-date years of monitoring and was listed as “transitional” or “less vulnerable” in previous monitoring seasons.

Lucia Cheng is a service and trending reporter on the Des Moines Register. Contact her at lcheng@gannett.com or 515-284-8132.