{ "lid": "MNDA2", "usgsId": "15052500", "reachId": "", "name": "Mendenhall River near Auke Bay", "description": "USGS GOES/HADS & NWS GOES/RAWS", "rfc": { "abbreviation": "APRFC", "name": "Alaska Pacific River Forecast Center" }, "wfo": { "abbreviation": "AJK", "name": "Juneau" }, "state": { "abbreviation": "AK", "name": "Alaska" }, "county": "Juneau", "timeZone": "AST9ADT", "latitude": 58.429722222222, "longitude": -134.57277777778, "pedts": { "observed": "HGIRZ", "forecast": "HGIFE" }, "status": { "observed": { "primary": 3.81, "primaryUnit": "ft", "secondary": 2.4, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-09-28T20:00:00Z" }, "forecast": { "primary": 3.82, "primaryUnit": "ft", "secondary": 2.41, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-09-29T00:00:00Z" } }, "flood": { "stageUnits": "ft", "flowUnits": "cfs", "categories": { "major": { "stage": 14, "flow": 22100 }, "moderate": { "stage": 10, "flow": 13400 }, "minor": { "stage": 9, "flow": 10400 }, "action": { "stage": 8, "flow": 7860 } }, "lro": null, "crests": { "historic": [ { "occurredTime": "2025-08-13T07:15:00Z", "stage": 16.65, "flow": 48900, "preliminary": "R", "olddatum": false }, { "occurredTime": "2024-08-06T03:15:00Z", "stage": 15.99, "flow": 42700, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-08-05T23:15:00Z", "stage": 14.97, "flow": 34200, "preliminary": "O", "olddatum": false }, { "occurredTime": "2026-08-13T23:05:00Z", "stage": 14.71, "flow": 32100, "preliminary": "P", "olddatum": false }, { "occurredTime": "2016-07-01T08:15:00Z", "stage": 11.99, "flow": 16300, "preliminary": "O", "olddatum": false }, { "occurredTime": "2014-07-11T00:00:00Z", "stage": 11.85, "flow": 15900, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-08-14T00:00:00Z", "stage": 11.56, "flow": 15200, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-08-01T00:00:00Z", "stage": 11.55, "flow": 15200, "preliminary": 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"flow": 9200, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-09-26T00:00:00Z", "stage": 7.88, "flow": 7160, "preliminary": "O", "olddatum": false }, { "occurredTime": "1995-09-11T00:00:00Z", "stage": 11.18, "flow": 16000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1994-09-22T00:00:00Z", "stage": 9.13, "flow": 10100, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-09-22T00:00:00Z", "stage": 10.18, "flow": 13000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1992-08-18T00:00:00Z", "stage": 8.48, "flow": 8480, "preliminary": "O", "olddatum": false }, { "occurredTime": "1991-09-06T00:00:00Z", "stage": 8.6, "flow": 8760, "preliminary": "O", "olddatum": false }, { "occurredTime": "1990-09-24T00:00:00Z", "stage": 9.75, "flow": 11800, "preliminary": "O", "olddatum": false }, { "occurredTime": "1989-09-23T00:00:00Z", "stage": 7.75, "flow": 6890, "preliminary": "O", "olddatum": false }, { "occurredTime": "1987-10-02T00:00:00Z", "stage": 9.18, "flow": 10200, "preliminary": "O", "olddatum": false }, { "occurredTime": "1986-08-13T00:00:00Z", "stage": 7.33, "flow": 5990, "preliminary": "O", "olddatum": false }, { "occurredTime": "1985-09-26T00:00:00Z", "stage": 6.19, "flow": 3990, "preliminary": "O", "olddatum": false }, { "occurredTime": "1984-08-26T00:00:00Z", "stage": 8.8, "flow": 9250, "preliminary": "O", "olddatum": false }, { "occurredTime": "1983-08-22T00:00:00Z", "stage": 9.4, "flow": 10800, "preliminary": "O", "olddatum": false }, { "occurredTime": "1982-09-03T00:00:00Z", "stage": 7.96, "flow": 7840, "preliminary": "O", "olddatum": false }, { "occurredTime": "1981-09-08T00:00:00Z", "stage": 10.91, "flow": 15500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1980-07-31T00:00:00Z", "stage": 8.77, "flow": 9790, "preliminary": "O", "olddatum": false }, { "occurredTime": "1978-08-09T00:00:00Z", "stage": 6.81, "flow": 5100, "preliminary": "O", "olddatum": false }, { "occurredTime": "1976-09-28T00:00:00Z", "stage": 8.67, "flow": 9820, "preliminary": "O", "olddatum": false }, { "occurredTime": "1975-09-14T00:00:00Z", "stage": 7.43, "flow": 6720, "preliminary": "O", "olddatum": false }, { "occurredTime": "1974-09-14T00:00:00Z", "stage": 8.51, "flow": 8400, "preliminary": "O", "olddatum": false }, { "occurredTime": "1972-09-15T00:00:00Z", "stage": 8.42, "flow": 7900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1971-08-03T00:00:00Z", "stage": 7.35, "flow": 5610, "preliminary": "O", "olddatum": false }, { "occurredTime": "1970-09-29T00:00:00Z", "stage": 8.91, "flow": 8860, "preliminary": "O", "olddatum": false }, { "occurredTime": "1968-09-07T00:00:00Z", "stage": 8.14, "flow": 7580, "preliminary": "O", "olddatum": false }, { "occurredTime": "1967-09-15T00:00:00Z", "stage": 8.43, "flow": 9020, "preliminary": "O", "olddatum": false }, { "occurredTime": "1966-08-24T00:00:00Z", "stage": 8.94, "flow": 8900, "preliminary": "O", "olddatum": false } ] }, "lowWaters": { "historic": [] }, "impacts": [ { "stage": 20, "statement": "This is an estimate of that water will flood into the backyards of homes along Gladstone St. Homes south of Mendenhall Loop Rd. will be inundated with flood waters as far east as N Loop Way. Significant flooding will impact homes and businesses on the west side of river. Water will be over Egan Dr in multiple sections of the valley making the road impassable. East of the river, most homes and businesses will be inundated with flood waters. Water will start to impact Mendenhall wastewater treatment plant. " }, { "stage": 19, "statement": "This is an estimate that water will be covering parts of Black Wolf Way, Pond Vista Dr as well as Slim Williams Way. Homes along Tournure St will start to be inundated. Flood waters will cover Egan Dr at Mendenhall Loop Rd while extending into the neighborhoods around Teslin St and Atlin Dr. Mendenhall Mall Rd will be completely covered in flood water. Significant flooding is expected for most businesses and homes on the west and east side of Mendenhall River near Egan Dr." }, { "stage": 18, "statement": "This is an estimate that water will be covering Tournure St. Water will be on both sides of Back Loop Rd at the intersection of Mint Way and extending down the north side down to Chelsea Ct. Water will start to cover Mendenhall Loop Rd and Egan Dr. Water starts to flood business between Sherwood Ln and Bentwood Pl. Neighborhoods south of Egan Dr and east of Radcliffe Rd will see water in low lying areas. Water will be across portions of Crazy Horse Dr." }, { "stage": 17, "statement": "This is an estimate that water will be overtopping the river banks and flooding into the homes around Wildmeadow Ln. Businesses in the Vintage Park Blvd area will be surrounded and potentially inundated by flood waters. Homes on Meadow Ln from Stikine St to Eagle St will be inundated with flood water. Water will be covering Tournure St from Riverside Dr to Columbia Blvd. Black Wolf Way and Pond Vista Dr will have water across the roads. All parts of View Dr will be covered by flood water." }, { "stage": 16, "statement": "Water starts to overtop the bank and flood low lying areas near Wildmeadow Ln. Up to 0.5 feet of water will be in the intersection of Skaters Cabin Rd and Arctic Cir. Some backyards of homes between Tamarack Ct and Whitewater Ct will start to see flood waters along with water approaching River Rd near homes with low river banks and possibly flooding those homes. Water will start to flood backyards of homes on Meadow Ln and Stikine St." }, { "stage": 15, "statement": "Major flooding of multiple homes along View Dr. Water will begin to approach a few homes along River Rd with low river banks with possible flooding of driveways and 1 to 2 feet of water in backyards. Up to 1 foot of water covering Riverside Dr at Tournure St and Mendenhall River School." }, { "stage": 14, "statement": "The low section of road past 9374 View Dr will be significantly flooded and impassable. Water will begin to flow over the road from water flowing behind homes on the north side of View Dr. More homes along View Dr will begin to see moderate to major flooding. Locations on River Rd with low river banks will begin to see water approach driveways." }, { "stage": 13.5, "statement": "Water starts to back up behind homes between Riverside Dr at Tournure St and Mendenhall River School. Locations on River Rd with low river banks will begin to see water inundate yards. Severe bank erosion along unreinforced river banks." }, { "stage": 13, "statement": "The low section of road past 9374 View Dr will be flooded with 2 ft of water. Water begins to flow through some backyards of homes on the northside of View Dr and flood low lying areas. A few locations on View Dr will see depths of 1 to 2 feet of water in homes. " }, { "stage": 12.5, "statement": "2 to 4 feet of water in some backyards along Meander Way on the the river side of the HESCO levee." }, { "stage": 12, "statement": "Significant bank erosion along unreinforced river banks. The low section of road past 9374 View Dr will be flooded with up to 0.5 feet of water. Some houses on the south side and the east end of View Dr will start to flood. Water begins to flood some backyards of homes on the northside of View Dr as well as other low lying areas. Back Loop Rd Bridge will be closed during outburst events. " }, { "stage": 11.5, "statement": "The low section of road past 9374 View Dr will begin to flood along with water approaching some homes towards the end of road. " }, { "stage": 11, "statement": "Some homes along View Dr will have up to 1.5 feet of water in yards. Locations below back loop bridge will see bank erosion along unreinforced river banks along with hazardous navigation from debris in the river. Homes along the river on Meander Way will begin to see flooding of some backyards on the outside of the HESCO levee. Portions of the Dredge Lake Trail System will be impassable. Flood waters start to reach Dredge Lake. " }, { "stage": 10.5, "statement": "Significant flooding along the Mendenhall Lake area with more than 3 feet of water in places near Mt. McGinnis trailhead and the Mendenhall Campground will be evacuated." }, { "stage": 10, "statement": "Water levels will inundate Mendenhall Campground with up to 3 feet of water covering low areas as well as up to 1.5 feet of water covering Skaters Cabin Road. Portions of West Glacier Trail will be impassable. Areas along View Dr will start to flood and cause minor flooding of yards. Closure of pedestrian pathways beneath Brotherhood Bridge and the trail system on the west side of Mendenhall River during outburst events. " }, { "stage": 9.5, "statement": "Water levels up to 0.5 feet will cover Skaters Cabin Road between Skaters Cabin and West Glacier Trailhead. Campsite 7 will be flooded with water starting to flow over the road between campsites 8 and 9 in the Mendenhall Campground." }, { "stage": 9, "statement": "Water starts to cover Skaters Cabin Road between Skaters Cabin and West Glacier Trailhead, also water will flow into the Mendenhall Lake Campground." }, { "stage": 7.7, "statement": "Nugget Falls trail begins to flood near the beginning of the trail. Along the Mendenhall River some sections will experience bank erosion resulting in dangerous tree fall. These conditions could make floating the river more hazardous with the higher water levels. " }, { "stage": 6.7, "statement": "Nugget Falls trail begins to flood near the \"causeway\" at the end of the trail. " } ] }, "images": { "probability": { "weekint": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/MNDA2.SSTG.prob.weekint.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/MNDA2.QINE.prob.weekint.gif", "volume": "" }, "entperiod": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/MNDA2.SSTG.exceed.90day.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/MNDA2.QINE.exceed.90day.gif", "volume": "" }, "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/MNDA2.shortrange.hefs.png" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/mnda2_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/mnda2_record.png" }, "photos": [ { "id": "14653597423259095534", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 58.429722222222, -134.57277777778 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/mnda2/14653597423259095534.jpeg", "caption": "Flooding pictures of Mendenhall campground " } }, { "id": "16051881106587259374", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 58.429722222222, -134.57277777778 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/mnda2/16051881106587259374.jpeg", "caption": "Bankfull stage 9.0ft #1" } }, { "id": "16085106041581212142", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 58.429722222222, -134.57277777778 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/mnda2/16085106041581212142.jpeg", "caption": "Bankfull stage 9.0ft #2" } }, { "id": "16121232566286029294", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 58.429722222222, -134.57277777778 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/mnda2/16121232566286029294.jpeg", "caption": "Bankfull stage 9.0ft #3" } }, { "id": "1421666601558938094", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 58.429722222222, -134.57277777778 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/mnda2/1421666601558938094.jpeg", "caption": "Flooding pictures of West Glacier spur road " } }, { "id": "17963433452169925102", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 58.429722222222, -134.57277777778 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/mnda2/17963433452169925102.png", "caption": "Flooding along the Mendenhall River near Meander Way. MNDA2 = 10.9ft" } }, { "id": "18066446842605146606", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 58.429722222222, -134.57277777778 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/mnda2/18066446842605146606.png", "caption": "Moderate flooding along Mendenhall River. MNDA2 = 10.5ft" } }, { "id": "18099488863531897326", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 58.429722222222, -134.57277777778 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/mnda2/18099488863531897326.png", "caption": "Moderate flooding along View Drive. MNDA2 = 10.9ft. " } } ] }, "dataAttribution": [ { "abbrev": "US Geological Survey", "text": "USGS 15052500", "title": "Observations courtesy of the US Geological Survey", "url": "https://waterdata.usgs.gov/monitoring-location/15052500/" } ], "impactsLowWaters": [], "normalThreshold": null, "hydronotes": [ { "statement": "Stage may be affected by ice during winter months.", "effective": "1101", "expiration": "0501" }, { "statement": "

Click here for Suicide Basin Monitoring Page", "effective": "0101", "expiration": "1231" } ], "datums": { "vertical": { "value": [ { "label": "Station Datum", "abbrev": "STND", "description": "A fixed base elevation at a tide station to which all water level measurements are referred. The datum is unique to each station and is established at a lower elevation than the water is ever expected to reach. It is referenced to the primary bench mark at the station and is held constant regardless of changes to the water level gauge or tide staff. The datum of tabulation is most often at the zero of the first tide staff installed.", "value": 0 }, { "label": "North American Vertical Datum of 1988", "abbrev": "NAVD88", "description": "A fixed reference for elevations determined by geodetic leveling. The datum was derived from a general adjustment of the first-order terrestrial leveling nets of the United States, Canada, and Mexico. In the adjustment, only the height of the primary tidal bench mark, referenced to the International Great Lakes Datum of 1985 (IGLD 85) local mean sea level height value, at Father Point, Rimouski, Quebec, Canada was held fixed, thus providing minimum constraint. NAVD 88 and IGLD 85 are identical. However, NAVD 88 bench mark values are given in Helmert orthometric height units while IGLD 85 values are in dynamic heights. See International Great Lakes Datum of 1985, National Geodetic Vertical Datum of 1929, and geopotential difference. NAVD 88 should not be used as Mean Sea Level.", "value": 0 }, { "label": "National Geodetic Vertical Datum of 1929", "abbrev": "NGVD29", "description": "A fixed reference adopted as a standard geodetic datum for elevations determined by leveling. The datum was derived for surveys from a general adjustment of the first-order leveling nets of both the United States and Canada. In the adjustment, mean sea level was held fixed as observed at 21 tide stations in the United States and 5 in Canada. The year indicates the time of the general adjustment. A synonym for Sea-level Datum of 1929. The geodetic datum is fixed and does not take into account the changing stands of sea level. Because there are many variables affecting sea level, and because the geodetic datum represents a best fit over a broad area, the relationship between the geodetic datum and local mean sea level is not consistent from one location to another in either time or space. For this reason, the National Geodetic Vertical Datum should not be confused with mean sea level. See North American Vertical Datum of 1988 (NAVD 88). NGVD 29 should not be used as Mean Sea Level. NGVD 29 is no longer supported by NGS.", "value": 60 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "JSBA2", "downstreamLid": "MNBA2", "inService": { "enabled": true, "message": "" }, "lowThreshold": null, "forecastReliability": "Forecasts are issued routinely during the warm season, and as needed at other times of the year.", "TruncateObs": "-1", "TruncateFcst": "-1", "ObservedFloodCategory": "no_flooding", "ForecastFloodCategory": "no_flooding" }