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US Army Corps of Engineers, Bonneville Lock and Dam

Federal facility (Sewerage Systems), Cascade Locks, Oregon. NPDES permit OR0022624, in force until Jun 30, 2030. Last 12 months: over a limit 2 times (last December 2025), 1 required value missing, 4 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (28 values), form G monthly (6 values), form QA quarterly (1 value), form RW quarterly (1 value)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 1 required value missing, 2 of 16 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
November 2025Solids, suspended percent removal, monthly average minimum82 %≥ 85 %20%
December 2025Solids, suspended percent removal, monthly average minimum83 %≥ 85 %13%

Limits in force (46)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year
Thermal Dischargemonthly average≤ 8.31 mkcal/dayJun–Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJan, Jul, Aug, Sep, Oct, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LFeb–Jun
BOD, 5-day, 20 deg. Cmonthly average≤ 33 lb/dJan, Jul, Aug, Sep, Oct, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 50 lb/dFeb–Jun
BOD, 5-day, 20 deg. Cdaily maximum≤ 67 lb/dJan, Jul, Aug, Sep, Oct, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 100 lb/dFeb–Jun
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LFeb–Jun
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/LJan, Jul, Aug, Sep, Oct, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 75 lb/dFeb–Jun
BOD, 5-day, 20 deg. Cweekly average≤ 50 lb/dJan, Jul, Aug, Sep, Oct, Nov, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
Alkalinity, total [as CaCO3]quarterly maximumreport only (mg/L)all year
Solids, total suspendedmonthly average≤ 30 mg/LFeb–Jun
Solids, total suspendedmonthly average≤ 20 mg/LJan, Jul, Aug, Sep, Oct, Nov, Dec
Solids, total suspendedmonthly average≤ 50 lb/dFeb–Jun
Solids, total suspendedmonthly average≤ 33 lb/dJan, Jul, Aug, Sep, Oct, Nov, Dec
Solids, total suspendeddaily maximum≤ 100 lb/dFeb–Jun
Solids, total suspendeddaily maximum≤ 67 lb/dJan, Jul, Aug, Sep, Oct, Nov, Dec
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 45 mg/LFeb–Jun
Solids, total suspendedweekly average≤ 30 mg/LJan, Jul, Aug, Sep, Oct, Nov, Dec
Solids, total suspendedweekly average≤ 75 lb/dFeb–Jun
Solids, total suspendedweekly average≤ 50 lb/dJan, Jul, Aug, Sep, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]quarterly maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly averagereport only (mg/L)all year
Chlorine, total residualdaily maximumreport only (mg/L)all year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 406 #/100mLall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximumreport only (#/100mL)all year
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year
Solids, suspended percent removalmonthly average minimum≥ 65 %all year
Chlorine usagemonthly averagereport only (lb/d)all year

New limits from Jan 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, monthly average0.42 mg/Lnew0.6 mg/L (12 values)1.43×
Chlorine, total residual, daily maximum1.1 mg/Lnew1.1 mg/L (9 values)1×

How strict are these limits?

Cited limits by parameter: Oregon's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OR0022624 · MCP: https://passage-data.com/mcp