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Home My WebLink About2025 Black Ave Traffic Circles -CIPBOZEMAN, MONTANACOVER SHEETTHE CITY OF BOZEMANENGINEERING DEPARTMENT20 E. OLIVE -- P.O. BOX 1230BOZEMAN, MONTANA 59771-1230PHONE: (406) 582-2280 -- FAX: (406) 582-2263GENERAL NOTES2025 BLACK AVENUE TRAFFIC CIRCLESAT EAST VILLARD STREET & EAST LAMME STREETCITY OF BOZEMAN, MONTANAOCTOBER 2025VICINITY MAPINDEXC1PROPOSEDWORK AREADANAE GIANNETTINo. 54410PEWSSDLEGENDRECORD DRAWING 27.0'24.8'27.2'DSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDWWWWWWWWWWWWWWSSSSSSSSSSSSS24.9'INSTALL 15.0' DIAMETER TRAFFICCIRCLE (MEASURED AT OUTER GUTTERLIP) IN ACCORDANCE WITH CITY OFBOZEMAN TRAFFIC CIRCLE DETAILDANAE GIANNETTINo. 54410PEPROTECT IN PLACEADJUST EXISTINGMANHOLE TO BEFLUSH WITH FINISHEDGRADEYELLOW CURB EPOXYCOORDINATE SIGNING MODIFICATIONSWITH CITY OF BOZEMAN STREETSDEPARTMENT (TYP.)6" THICK CONCRETE CAP (2% SLOPE)RECORD DRAWINGNO ASPHALTREPLACEMENT 25.7'25.7'25.8'SDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWSSSSSSSSSSSSSSSSSSSSSSSS25.9'ADJUST EXISTINGMANHOLE TO BEFLUSH WITH FINISHEDGRADEYELLOW CURB EPOXYINSTALL 15.0' DIAMETER TRAFFICCIRCLE (MEASURED AT OUTER GUTTERLIP) IN ACCORDANCE WITH CITY OFBOZEMAN TRAFFIC CIRCLE DETAILCOORDINATE SIGNING MODIFICATIONSWITH CITY OF BOZEMAN STREETSDEPARTMENT (TYP.)6" THICK CONCRETE CAP (2% SLOPE)DANAE GIANNETTINo. 54410PENO ASPHALTREPLACEMENTRECORD DRAWING D1.1 - COB TRAFFIC CIRCLEYIELD (R1-2) ANDROUNDABOUTCIRCULATION(R6-5P)INTERSECTION LEGEND & TYPICAL DIMENSIONSS - STREET WIDTH (MEASURED TBC TO TBC)S = 36' TYPICALR - CURB RADIUS (MEASURED AT TBC)R = 10' TYPICALD - TRAFFIC CIRCLE DIAMETER (MEASURED AT EDGE OF CURB)D = 20' TYPICALW - OPENING WIDTH (MEASURED FC TO FC)W ≈ 20' TYPICALTRAFFIC CIRCLE GOALS AND DESIGN CRITERIAPROVIDE AT THE LOWEST COST A TRAFFIC CIRCLE THAT WILL REDUCE TRAFFIC SPEEDS AND ACCIDENTS WHILE ALLOWING FOR THEMOVEMENT OF LARGE TRUCKS. THE TRAFFIC CIRCLE SHALL BE MADE AS LARGE AS POSSIBLE TO PROMOTE SLOW SPEEDS THROUGH THEINTERSECTION WHILE MAINTAINING THE DESIRED OPENING WIDTH. THE CENTER OF THE TRAFFIC CIRCLE SHALL BE PLACED WHERE THECENTER OF EACH INTERSECTION LEG MEET. EXISTING INTERSECTIONS MAY HAVE VARYING WIDTHS, CURB RADIUS, AND INTERSECTIONANGLES. DIMENSIONS OF THE INTERSECTION MUST BE VERIFIED PRIOR TO DESIGN OF A NEW TRAFFIC CIRCLE. USE THE FOLLOWING DESIGNCRITERIA TO DETERMINE THE DIMENSIONS OF NEW TRAFFIC CIRCLE.1. THE PRIMARY DESIGN GOAL IS TO ACHIEVE THE TARGETED OPENING WIDTH OF 20-FEET ± 1-FOOT.2. THE DIAMETER OF THE TRAFFIC CIRCLE SHALL BE ADJUSTED TO MEET THE TARGETED OPENING WIDTH.3. TRAFFIC CIRCLES SHALL HAVE A MINIMUM DIAMETER OF 15'.4. WHERE THE MINIMUM DIAMETER CANNOT BE MET THE INTERSECTIONS CURBS SHALL BE RECONSTRUCTED.5% SLOPE11MINUS CRUSHEDBASE, ADD SUB-BASECOURSE AS REQUIREDSAW CUT AND REPLACEASPHALT 2' MIN. (INEXIST INTERSECTIONS)COMPACT EXIST.SUB-GRADEINSTALL ASPHALT14"ABOVE LIP OF CURB2% SLOPE3" CONCRETECAPEXPANSIONJOINT MATERIAL4% SLOPE5' WIDE, 6" DEPTH,CONCRETE APRONSPILL DROPCURB FORDRIVEWAYSFLEXIBLEDELINEATOR℄TRAFFIC CIRCLE ISLAND PROFILE1.THE CENTER CAP OF THE TRAFFIC CIRCLE ISLAND SHALL BE SLOPED AT 2% AWAY FROM THE CENTER OF THE ISLAND. THE APRON SHALLBE SLOPED AT 5% AWAY FROM THE CENTER OF THE ISLAND.2.CURB, APRON, AND CENTER CAP SHALL BE M-4500 CONCRETE THAT IS AIR ENTRAINED AND IN CONFORMANCE WITH SECTION 02528(MPWSS).3.SUB-GRADE & BASE COURSE COMPACTION SHALL CONFORM WITH SECTION 02230 (MPWSS).4.CRUSHED BASE COURSE SHALL MEET THE REQUIREMENTS OF SECTION 02235 (MPWSS). CRUSHED BASE COURSE SHALL HAVE A MINIMUM12" DEPTH UNDER NEW ASPHALT, CURB, AND APRON; AND A 6" DEPTH UNDER THE CONCRETE CAP.5.CURB & GUTTER SHALL BE INSTALLED IN ACCORDANCE WITH CITY OF BOZEMAN STD. DWG. 02528-1.6.CURB CONTRACTION JOINTS SHALL BE PLACED AT ≈10' INTERVALS (MEASURED ALONG THE CENTER OF THE CURB) AND SHALL HAVE AMINIMUM DEPTH OF3AND A MINIMUM WIDTH OF18".7.APRON CONTRACTION JOINTS SHALL PLACED AT ≈5' INTERVALS (MEASURED HALFWAY ALONG THE RADIUS OF THE APRON) AND SHALLHAVE A MINIMUM DEPTH OF 1" AND MINIMUM WIDTH OF18".8. EXPANSION JOINT MATERIAL SHALL BE PLACED BETWEEN THE CENTER CAP AND APRON. EXPANSION JOINT MATERIAL SHALL BE1THICKPRE-FORMED BITUMINOUS TREATED FIBERBOARD FILLER.9.PAINT FACE AND TOP OF DROP CURB WITH YELLOW EPOXY PAINT IN ACCORDANCE WITH SECTION 620 OF "STANDARD SPECIFICATIONFOR ROAD AND BRIDGE CONSTRUCTION", LATEST EDITION, ADOPTED BY THE MONTANA DEPARTMENT OF TRANSPORTATION AND BMC36.04.03010.FLEXIBLE DELINEATORS SHALL BE INSTALLED 2.5-FEET BEHIND THE BACK OF THE CURB. FLEXIBLE DELINEATORS SHALL BE U-FLEX FLUSHMOUNT DELINEATOR #FCW36W3U3 BY SHUR-TITE OR APPROVED EQUAL AND INSTALLED IN ACCORDANCE WITH THE MANUFACTURE'SRECOMMENDATIONS.11.BASE PREPARATION AND FORM WORK SHALL BE INSPECTED BY THE CITY ENGINEERING DIVISION PRIOR TO PLACING ASPHALT ORCONCRETE.12.SUB-BASE COURSE IS REQUIRED WHERE UNSUITABLE SUB-GRADE CONDITIONS ARE ENCOUNTERED.D1.2 - COB TRAFFIC CIRCLE TYPICAL SECTIONRECORD DRAWING D2.2 - COB MANHOLE ADJUSTMENTD2.1 - COB STANDARD CURB & GUTTERSTANDARDCURB & GUTTERNO. 02528-110/2024SCALE:NONECITY OF BOZEMANSTANDARD DRAWINGCATCH CURB9.5"2"6.10"6" OR OTHERWISEAS REQUIRED4"R3"R4% SLOPE-4% SLOPE24"24"24"6.66"9.5"1.51"0.49"9.5"0.75"4% SLOPE4% SLOPENOTES:1.SUBGRADE OR BASE COURSE COMPACTION SHALL CONFORM TO SECTION 02230 (MPWSS).2. CONTRACTION JOINTS SHALL BE PLACED AT 10' INTERVALS AND SHALL HAVE A MINIMUM DEPTH OF 3/4" ANDMINIMUM WIDTH OF 1/8".3.1/2" EXPANSION JOINT MATERIAL SHALL BE PLACED AT ALL P.C.S, P.T.S, CURB RETURNS AND AT NOR MORETHAN 300' INTERVALS. THE EXPANSION MATERIAL SHALL EXTEND THROUGH THE FULL DEPTH OF THE CURBAND GUTTER.4. NO CURB AND GUTTER SHALL BE PLACED WITHOUT A FORM AND/OR STRINGLINE INSPECTION BY THE CITYENGINEERING DIVISION.5. CONCRETE SHALL BE M-4500.6.CRUSHED GRAVEL BASE SHALL MEET THE REQUIREMENTS OF SECTION 02235 (MPWSS) FOR CURB ANDGUTTER REPLACEMENT PROJECTS, WASHED ROCK MAY BE USED FOR THE GRAVEL BASE.7. STANDARD CATCH CURB SHALL MATCH DIMENSIONS OF MONTANA DEPARTMENT OF TRANSPORTATIONDETAILED DRAWING NUMBER 609-05.8. STANDARD CATCH CURB MOLD MAY BE ROTATED ABOUT LIP OF GUTTER TO CONSTRUCT SPILL CURBS.CATCH DROP CURB FOR DRIVEWAYSSPILL CURBCATCH DROP CURB FOR PEDESTRIAN RAMPS24"-4% SLOPE-4% SLOPESPILL DROP CURB FOR DRIVEWAYSSPILL DROP CURB FOR PEDESTRIAN RAMPS2.27"5.52"24"24"9.5"1.51"0.93"2.85"2.09"0.17"7.42"6.59"1.01"9.5"CRUSHEDGRAVELBASE, 3"MIN.SUB-BASECOURSE ASREQUIRED9"NOTES:1. ADJUST MANHOLES UPWARD WITH ADJUSTING RINGS UNDER FRAME.2. ADJUST MANHOLE DOWNWARD BY REMOVING CONE AND BARREL SECTIONS ASNECESSARY AND REPLACING WITH SECTIONS OF LENGTH REQUIRED TO MATCHGRADE.3.SLOPE MANHOLE FRAME AS REQUIRED TO MATCH SLOPE OF STREET.4. FINAL MANHOLE ADJUSTMENT SHALL BE MADE BEFORE PAVING.5.ALL JOINTS BETWEEN MANHOLE SECTIONS, TOP CONE, ADJUSTING RINGS, ANDMANHOLE RING SHALL BE WATERTIGHT. JOINT MATERIAL SHALL BE "RAM-NEK" ORAPPROVED EQUAL.6.MANHOLE RING AND COVER SHAL BE ADJUSTED TO MATCH FINAL CROWN ANDGRADE OF STREET. USE PRECAST CONCRETE FABRICATOR OR APPROVED EQUALCONCRETE ANGLED ADJUSTMENT RINGS TO OBTAIN REQUIRED ANGLE.7.MANHOLE RING AND COVER: USE D&L FOUNDRY A-1178, OR EAST JORDAN IRONWORKS 3771/3772 SERIES RING COVER, OR APPROVED EQUAL.8.ALL MANHOLES LOCATED WITHIN STREETS SHALL BE CONSTRUCTED WITHCONCRETE COLLAR.9.FRIBILLATED POLYPROPYLENE FIBER MAY BE USED IN LIEU OF #4 REBAR INCONCRETE COLLARS.PLANSECTION A-AAAA#4 REBAR AT 20" SPACING#4 REBAR HOOPS (2 EACH).SEE SECTION A-A.SCORES (TYP.)1'-0" MIN.HOT MIX ASPHALTCONCRETE ADJUSTINGRINGS AS NECESSARY(2" MIN. - 12" MAX.)MANHOLE FRAMECONCRETE COLLAR24" MIN.2", MIN.3/8" ± 1/8"6"8"COMPACTED BASEAND SUBGRADEMANHOLE ADJUSTMENTNO. 02213-110/2024SCALE:NONECITY OF BOZEMANSTANDARD DRAWINGRECORD DRAWING 2820.0MilesThis product is for informational purposes and may not have been prepared for, or be suitable for legal, engineering, orsurveying purposes. Users of this information should review or consult the primary data and information sources toascertain the usability of the information. Feet330Legend16Location33DGiannettiCreated By:Created For:Date:Olive and 6thStreet NamesCity LimitsWorld ImageryLow Resolution 15m ImageryHigh Resolution 60cm ImageryHigh Resolution 30cm ImageryCitations7.5cm Resolution Metadata23 ft23 ft19 ft19 ftWEST OLIVE STREET AND SOUTH 6TH AVENUE TRAFFIC CIRCLEEXISTINGMANHOLENOTE: CITY OF BOZEMANSTREETS DEPARTMENT TOPAINT YELLOW CURB EPOXY,INSTALL SIGNAGE ANDDELINEATORS. CONTRACTORTO WET SET DELINEATORBASES PROVIDED BY CITYSTAFF.ADJUST EXISTINGMANHOLE TO BEFLUSH WITHFINISHED GRADEMAXIMUM 2'ASPHALT PATCH INFRONT OF TRAFFICCIRCLE, AS NEEDEDINSTALL 15'DIAMETER TRAFFICCIRCLE (MEASUREDAT OUTER GUTTERLIP) IN ACCORDANCEWITH CITY OFBOZEMAN TRAFFICCIRCLE DETAIL6" THICKCONCRETE CAP(2% SLOPE)04/15/2026BLACK AVE TRAFFICCIRCLES CHANGEORDER PRICINGRECORD DRAWING(CHANGE ORDER)